一道关于时间状语从句的选择题His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.A.after B.before C.when D.as答案选择before,可是我想如果选择before,前面貌似确实要

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一道关于时间状语从句的选择题His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.A.after B.before C.when D.as答案选择before,可是我想如果选择before,前面貌似确实要
一道关于时间状语从句的选择题
His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.
A.after B.before C.when D.as
答案选择before,可是我想如果选择before,前面貌似确实要改为过去完成时,但是这里好像有一个any起了作用,而使得我们不得不选before,我还没琢磨透,还请各位指教,
请问有没有硬性要求说before前面必须用过去完成时呢？

一道关于时间状语从句的选择题His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.A.after B.before C.when D.as答案选择before,可是我想如果选择before,前面貌似确实要
1.因为any 是不确定的,显然,他还没有机会见到任何那个时代的物理学家.所以用before.
2.这里也可以用过去完成时.但是因为they hung up 和 I could answer,几乎是同时的,所以用过去时就可以.选 before 是因为句子的意思需要.在我能接听电话前,他们就挂断了（电话）.这里的before I could 有我没能XX.

一道关于时间状语从句的选择题His greatest work was done ____ he had the opportunity of meeting any of the great men of physics of his day.A.after B.before C.when D.as答案选择before,可是我想如果选择before,前面貌似确实要原因状语从句的选择题要有关于题的解析时间状语从句选择题3道一道关于时间状语从句连词的英语选择题Ships may have to wait for a couple of days,_____ waves are not rough,permitting them to enter the harbor with safety.A.after B.while C.when D.since 时间状语从句的用法时间状语从句的用法时间状语从句的时态时间状语从句与条件状语从句的区别时间状语从句的先后顺序是什么?时间状语从句地点状语从句原因状语从句结果状语从句目的状语从句比较状语从句让步状语从句条件状语从句这些壮语哪个在先哪个在后啊? 关于英语时间状语从句和条件状语从句!我知道在时间状语从句和条件状语从句中,如果主句是一般将来时,从句用一般现在时替代一般将来时.除此之外,还有什么其他用法!如果主句换做其他的请举几个关于when引导时间状语从句和宾语从句的例子越多越好关于从句的引导词帮个忙把能引导不同从句的引导词列一下.顺便说一下是引导什么从句例：as可引导时间状语从句,原因状语从句,比较状语从句.非限定性定语从句, 英语都有哪些状语从句?像时间状语从句,条件状语从句那种的? 关于状语从句中as的用法~请高手帮忙解释下~怎么区分由as引导的从句是时间状语从句~原因状语从句还是比较或方式状语从句?不同点在哪? 关于宾语从句的选择题. 时间状语从句 when的用法急～ when引导的时间状语从句 each time引导的时间状语从句