题目内容
17.Thousands of survivors _________ since the earthquake happened.( )A. | have rescued | B. | have been rescued | ||
C. | had rescued | D. | had been rescued |
分析 自从地震发生数以千计的幸存者被营救.
解答 答案是B. 考查被动语态,主语thousands of surviors与动词rescue之间是被动关系,"数以千计的幸存者被营救",since引导的时间状语中主句要用have+过去分词,所以答案选B.
点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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