【牛津译林版】(江苏专用)2012届高三英语一轮复习精品学案：语法部分 第9讲 状语从句(10)

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A. when

B. while D. once C. since

【解析】

21. B before这里表示“过了……(时间)才”，引导时间状语从句。

22. A when是等立连词，表示“正在这时”。

( )23. Parents should take seriously their children's requests for sunglasses ______ eye protection is necessary in sunny weather.

A. because

C. unless B. through D. if

( )24. It was evening ______ we reached the little town of Winchester.

A. that

C. since

【解析】

23. A because引导原因状语从句。

24. D before引导时间状语从句，表示“在( be in demand.

A. While

C. As B. Since D. If B. until D. before

(

A. however

C. although

【解析】

25. A while引导条件状语从句，表示“虽然、尽管”。

26. A however引导让步状语从句，相当于no matter how。

( )27. We were told that we should follow the main road ______ we reached the central railway station.

A. whenever

C. while B. until D. wherever B. no matter D. whatever

( )28. Scientists say it may be five or six years ______ it is possible to test this medicine on

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