【題目】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,空氣污染將成為一個嚴(yán)重的問題,那會危及人類的健康。根據(jù)句意,此句要用將來完成時,將來完成時的結(jié)構(gòu): shall/will have+過去分詞。故選C。

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