_______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.A.Basing B.Based C.Been based D.Having based包括知识点及理由!

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_______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.A.Basing B.Based C.Been based D.Having based包括知识点及理由!
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_______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.A.Basing B.Based C.Been based D.Having based包括知识点及理由!
_______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.
A.Basing B.Based C.Been based D.Having based
包括知识点及理由!

_______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.A.Basing B.Based C.Been based D.Having based包括知识点及理由!
B
based on 直接可以用 表示在.基础上 记住就行了哈
例如
Based on these principles,I have four proposals.
基于这些原则,我有以下四项提议.
Managers earn fees,based on a proportion of assets under management.
管理者赚取基于其管理的一部分资产的费用.
Concentration is distinct from dehydration,based on differences in final water content and product characteristics.
由于最终的水分含量和产品特性不同,浓缩与脱水是不同的.

Based on 是固定搭配 表示建立在...的基础上 这道题没有什么时态因素 所以选B 毫无疑问

B,完整的句子为When Professor Wang is based on......,因为前面省略了

选A吧，Professor 和base 是主动的关系。
这种题目就是考主语和前面的动词是主动关系呢还是被动关系

His grandfater died ten years ago.同义句转换 His grandfater _______ _______ _______for ten years. His grandfather died ten years ago(对ten years ago提问） _____ _______ His grandfather______? ten years on 如例句Is the West any wiser,ten years on? He learned English by _______(he) ten years ago. My grandfather has been _______ for ten years (die) Kate and Tom got married ten years ago (同义句转换）Kate______　_______　_______ Tom for ten years I left school ten years ago.(改为同义句)I _______ ________ ________ from school ________ ten years. I began to teach English ten years ago.(意思不变）I ______ _______ English for ten years Were there any trees on those hill ten years ago? Tom started to collect movie tickets ten years ago的同义句Tom _______ _______ _______ movie tickets ten years ago. 2.this tree is ten years old.that tree is ten years old,too.(改为同义句)this tree is _______ _______ _______ that tree . 写出同义句We have known each other for ten years.We _______ ________ _________ each other _______ _______ _______. lt is ten years since l joined the Party.（改为简单句）l _______ ________ a Party member _______ ten years. My sister came here ten years ago(同义句）My sister came here ten years ago(同义句）My sister _____ ____here ______ten years agoThe film has been on for half an hoursIt ______half an hour ______the film _______ ten on ten _Will there be fewer students in ten years?-yes,_______ ______ He has _______(teach) English for ten years,teach该用什么时态 _______ on ten years of observation and study,Professor Wang announces that everyone dreams every night,whether they realize it or not.A.Basing B.Based C.Been based D.Having based包括知识点及理由!