This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou此题为什么选A不选B呢?或此题正确做法是?

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This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou此题为什么选A不选B呢?或此题正确做法是?
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This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou此题为什么选A不选B呢?或此题正确做法是?
This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou
此题为什么选A不选B呢?或此题正确做法是?

This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou此题为什么选A不选B呢?或此题正确做法是?
英文中,有时使用主动语态来表达这种被动语态.这个句子中Problem应该是动作的接受者,但是用主动语态来表达”被解出“.类似的句子还有：
1. The house needs cleaning.
房子需要（”被“）清扫.
2. The pen writes well.
这个钢笔（”被“）写的流畅.
你可以看一下英文中主动表被动的归纳总结：
http://wenku.baidu.com/view/1cb44a7d27284b73f2425098.html

problem难题，需要“被解出”，要用被动语态be +过去分词 的结构，所以是B

this is a （ ) problem This book is ()(real) interesting This car is real lemon. This problem is very___for her. is this real love visio翻译 this car is a real leamon是什么意思 This tool is a real eye opener. this is the real piano on which __ __ THIS MATHS PROBLEM IS ! It is difficult () out this maths problem This problem is not above us . this problem is difficult and ---------- (bore). i have this dream,right inside of me.this is real,this is me是什么意思? This is an awesome love story in the real life! this is the setup to the real thing 啥意思? 急求翻译This is not real statistics. Is this article about a real person in England? I will see your true colors,this is the real