【題目】 I was watching TV the lights went off.

A. when B. while C. as D. for

【答案】A

【解析】

試題分析:句意:當燈熄滅的時候我正在看電視。A. when當…時候,主句用一般進行時態(tài),從句用一般時態(tài);B. while在……同時,它只能表示一段時間,主句用一般時態(tài),后面從句一般用進行時態(tài);C. as正當…時候,主句和從句所表示的兩個同時進行的動作含有“一邊……一邊”之意時,則習慣上要用as; D. For為了,因為。結(jié)合句意可知選A。

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