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When first____ to the market, these products enjoyed great success.
A.being introducedB.having introducedC.introducedD.introducing
C

试题分析:这是When引导的省略句,应为:When they were first introduced to the market,这里省略了they were,故选C。状语从句的省略,注意状语从句中的主语同主句主语的一致性,并且从句的主语后有be 时,这时主语和be一起省略。
点评:本题难度适中。为了使话说得简明扼要,英语句子中某个单词、短语甚至从句或主句都可以省去。这种省去句子某些成分而保持句子意思不变的现象,称为省略。它是高中阶段的重要的语法项目,需要考生仔细分析句子结构,来确定省略的内容。
即学即练:If ____ possible, I’ll go there with you.(补充省略的部分)。
解析:If (it is) possible, I’ll go there with you.
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