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

游客2024-07-01 50

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

选项

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。

转载请注明原文地址:http://tihaiku.com/zcyy/3658616.html

相关试题推荐

随机试题

最新回复(0)

Inthepastfewyears,trafficproblems(become)______moreandmoreserious.ha