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

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...

全部展开

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.

收起

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。
...

全部展开

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。

收起

“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