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.
