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外语
In the past few years, traffic problems (become) ______ more and more serious.
In the past few years, traffic problems (become) ______ more and more serious.
admin
2013-05-07
72
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。
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本试题收录于:
大学英语三级A级题库大学英语三级分类
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大学英语三级
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