【題目】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】考查時態(tài)；根據(jù)句意“最后這幾年見證了歷史上環(huán)境災害最嚴重的一段時期，專家預測，接下來情況會更糟糕”可知，“the worst period on record for environmental disasters”是現(xiàn)在已經(jīng)發(fā)生了的動作，所以用現(xiàn)在完成時，故選C.

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