In the past few years, traffic problems (become) ______ more and more serious.

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问题 In the past few years, traffic problems (become) ______ more and more serious.

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答案have become

解析 本题考查动词时态。in the past few years作时间状语时,要求句子用现在完成时.另外,主语traffic problems为复数,因此,空格处填have become。
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