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【题目】Before the end of the nineties, air pollution ______ a serious problem that endangers the health of the human race. ( )

A.will be becomeB.will become

C.will have becomeD.will have been become

【答案】C

【解析】

句意:在90年代末之前,空气污染将成为一个严重的问题,那会危及人类的健康。根据句意,此句要用将来完成时,将来完成时的结构: shall/will have+过去分词。故选C

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