填空题In the past few years, traffic problems (become) ____ more and more serious.
填空题
In the past few years, traffic problems (become) ____ more and more serious.
参考解析
解析：
本题考查完成时态用法。句意：在过去的几年里，交通问题变得越来越严重了。时间状语in the past few years提示，此处要选择现在完成时态。故填入have become。
本题考查完成时态用法。句意：在过去的几年里，交通问题变得越来越严重了。时间状语in the past few years提示，此处要选择现在完成时态。故填入have become。
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