问题描述：
These children often____their teacher
A:play an important role in
B:keep a check on
C:play a trick on
D:keep track of
选哪个?为什么?（我现在正在初学英语,
A:play an important role in
B:keep a check on
C:play a trick on
D:keep track of
选哪个?为什么?（我现在正在初学英语,
问题解答：
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