问题

The population of many Chinese cities has_________ doubled in the past 30 years.

A:larger than
B:more than
C:as great as
D:quite a bit

正确答案是：

同类题型

This kind of gel pen which ______ smoothly is quite popular with students

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_____worried about me，Mom.I’ve grown up.

Shall I tell Tom about it– No, you _______. I’ve told him already.

Kobe Bryant basketball in NBA since1996