问题描述：
A：Where ____[be] the children?B：Look,they _______[be] over there.A：What _____they ____ they
_______[do] here?
B:They______[listen] to the CDs.
用适当的动词形式填空.
_______[do] here?
B:They______[listen] to the CDs.
用适当的动词形式填空.
问题解答：
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