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

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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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Inthepastfewyears,trafficproblems(become)______moreandmoreserious.ha