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【题目】China's high-speed trains _________ and perfected now.
A.developed
B.have developed
C.are being developed
D.will have been developed

【答案】C
【解析】句意:中国的高速列车现在正在发展和完善。根据now可知用现在进行时,train与develop构成被动关系,故用现在进行时的被动语态:is/are being+过去分词,所以选C。

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