题目内容
Last night's TV news said that by then the death of the missing people ________(未证实)yet.(prove)
答案:had not been proved
解析:
解析:
|
考查动词的时态和语态。由by then可知谓语要用过去完成时,prove与the death之间是被动关系,故用过去完成时的被动语态。 |
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