题目内容

【题目】The last few years ___ the worst period on record for environmental disasters and experts are predicting far worse to come.

A. see B. saw

C. have seen D. are seeing

【答案】C

【解析】考查时态；根据句意“最后这几年见证了历史上环境灾害最严重的一段时期，专家预测，接下来情况会更糟糕”可知，“the worst period on record for environmental disasters”是现在已经发生了的动作，所以用现在完成时，故选C.

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