His name is Marco Polo,and it is 750 years ____ he was born.A.before B.after C.since D.as soon as为什么要用since?顺便总结一下since,as soon as的用法

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His name is Marco Polo,and it is 750 years ____ he was born.A.before B.after C.since D.as soon as为什么要用since?顺便总结一下since,as soon as的用法
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His name is Marco Polo,and it is 750 years ____ he was born.A.before B.after C.since D.as soon as为什么要用since?顺便总结一下since,as soon as的用法
His name is Marco Polo,and it is 750 years ____ he was born.
A.before B.after C.since D.as soon as
为什么要用since?顺便总结一下since,as soon as的用法

His name is Marco Polo,and it is 750 years ____ he was born.A.before B.after C.since D.as soon as为什么要用since?顺便总结一下since,as soon as的用法
as soon as :(adv.)"一...就...",强调两个动作几乎是连在一起的,后接从句.
1.当主句是一般将来时时,as soon as引导的状语从句应用一般现在时;
2.当主句是过去将来时时,as soon as引导的状语从句应用一般过去时.
有时跟某些单词如与possible相连—"as soon as possible",其实是as soon as IT IS possible的省略形式,译为"尽快".
eg.
As soon as he finishes his classwork,he runs out of the class.他一做完课堂作业,就跑出了教室.
I will came as soon as possible.
而 since 此处是表示“自从”的意思 这句话的意思是“自从他出生那时起就被叫做Marco Polo,到现在已经750年了”
又如:
It is forty-five years since the People’s Republic of China was founded.中华人民共和国成立已经四十五周年了.
He has lived in this house ever since he was born.他自出生以来一直住在这座房子里.

as soon as :(adv.)"一...就...",强调两个动作几乎是连在一起的,后接从句。
1.当主句是一般将来时时,as soon as引导的状语从句应用一般现在时;
2.当主句是过去将来时时,as soon as引导的状语从句应用一般过去时。
有时跟某些单词如与possible相连—"as soon as possible",其实是as soon as I...

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as soon as :(adv.)"一...就...",强调两个动作几乎是连在一起的,后接从句。
1.当主句是一般将来时时,as soon as引导的状语从句应用一般现在时;
2.当主句是过去将来时时,as soon as引导的状语从句应用一般过去时。
有时跟某些单词如与possible相连—"as soon as possible",其实是as soon as IT IS possible的省略形式,译为"尽快"。
eg.
As soon as he finishes his classwork, he runs out of the class. 他一做完课堂作业,就跑出了教室。
I will came as soon as possible.

而 since 此处是表示“自从”的意思 这句话的意思是“自从他出生那时起就被叫做Marco Polo,到现在已经750年了”
又如:
It is forty-five years since the People’s Republic of China was founded. 中华人民共和国成立已经四十五周年了.
He has lived in this house ever since he was born.他自出生以来一直住在这座房子里.

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since:1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
2) since +一段时间+ ago
3) since +从句
4) It is +一段时间+ since从句
as soon as:as soon as表示一。。。就,其中的从句通常用一般现在时表示将来时。
...

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since:1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
2) since +一段时间+ ago
3) since +从句
4) It is +一段时间+ since从句
as soon as:as soon as表示一。。。就,其中的从句通常用一般现在时表示将来时。
这个短语用的比较常用,口语和书面语都可以。它的特点是,在句子中的位置比较灵活,而且可以用于各种时态。

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“it is +时间+since+一个过去时的句子 ”这是一个句型,所以选since.
since是“从……以来”的意思
as soon as是“一……就……”的意思