题目内容
Beijing ________ so rapidly that maps of the city go out of date almost as soon as they are published.
[ ]
A.changes
B.has changed
C.is changing
D.has been changed
答案:C
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题目内容
Beijing ________ so rapidly that maps of the city go out of date almost as soon as they are published.
A.changes
B.has changed
C.is changing
D.has been changed