Owing to the level of the damage to factories and infrastructure.it will be weeks or even months the country's supply chain returns to normal．( )A．thatB．beforeC．whenD．since 题目和参考答案——青夏教育精英家教网——

题目内容

15．Owing to the level of the damage to factories and infrastructure，it will be weeks or even months ________ the country's supply chain returns to normal．（　　）

A．

that

B．

before

C．

when

D．

since

分析由于工厂和基础设施的损坏程度严重，要数周或甚至数月的时间该国的供应链才能恢复正常．

解答答案B．
"It will be+一段时间+before（从句中使用一般现在时表将来）"是固定句型，意思是"要再过…才…"，也可用于"It+may be+时间段+before…"，表示"也许要过多久才„„"．根据句子所表达的意思"要数周或甚至数月的时间该国的供应链才能恢复正常"可知答案选B．本句不是强调句或者定语从句，因此A项不正确；"It be+时间点+when引导的时间状语从句"表示"某个动作发生时，是某个时间"，主句谓语动词可以是一般过去时，也可以是一般将来时，weeks or even months是时间段，故C不正确；"It be+时间段+since引导的时间状语从句"表示"自从„„已经有多长时间了"，主句用一般现在时或现在完成时，选since的话，意思不通顺，故D不正确．

点评有时候before引导的时间状语从句与since，when引导的时间状语从句在下列结构中较相似，容易混淆．
"It be+时间段+since引导的时间状语从句"表示"自从„„已经有多长时间了"．主句用一般现在时或现在完成时．
"It be+时间点+when引导的时间状语从句"表示"某个动作发生时，是某个时间"．主句谓语动词可以是一般过去时，也可以是一般将来时．
（1）It is almost five years ________ we saw each other last time．（2005北京春）
A．before B．since C．after D．when
（2）-Did Jack come back early last night？（2005福建）
-Yes．It was not yet eight o'clock________ he arrived home．
A．before B．when C．that D．until
解析：答案为B、B．
考题（1）考查的是"It be+时间段+since引导的时间状语从句"结构，句意是"自从上次我们见面以来已经近五年没有见了"，故选择答案B．考题（2）考查的是句型"It be+时间点+when引导的时间状语从句"，句意是"他昨晚回家时还不到8点"，故选择答案B．

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