天津靠谱的搬家公司:火急,谢谢

来源:百度文库 编辑:高考问答 时间:2024/05/05 20:41:20
A man escaped from the prison last week.It was a long time ________the guards discovered what had happened.
A.since B.before
请各位帮忙选选正确答案,并仔细说明一下为什么选这个,为什么不选其他的原因,谢谢

选A
固定句型

since的四种用法
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)。
I have been here since 1989.

2) since +一段时间+ ago
I have been here since five months ago.

3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.

B
直译就是 在守卫发现那个人逃跑之前已经过了很长时间
意思是过了很久才发现那个人跑了

b before,在...之前,但在这儿是before的特殊用法.表示某件事情发生很长时间以后才....
意思:他逃跑很长时间以后警卫们才发现.

b
用A的话翻译一下:1个人上周越狱了,自从守卫发现这事情,已经过了很长时间.
根本不通啊

B.
since---自从
before--..之后

语感上觉得要选A, 但看意思是选b