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16.Twenty-five countries _______ for help in the search for the missing ship these days.(  )
A.have askedB.was askedC.have been askedD.asked

分析 这些天已经有25个国家被要求来帮助搜寻丢失的船只.

解答 答案:C.
根据时间状语these days,可知使用现在完成时,countries 和谓语动词ask之间是被动关系,因此使用现在完成时的被动语态故答案选C.

点评 能够用于现在完成时中的一些时间状语:up to now,until now,so far,in the last few years,these days,these years等,并且分清句中成分的主被动关系.

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