问题描述：
关于while
11.My sister __________( sing ) while my brother _________( play ) games.
12.The young man ___________( excite ) while ________( make ) a speech in the park.
可以说明一下关于while前后动词怎么用吗?
11.My sister __________( sing ) while my brother _________( play ) games.
12.The young man ___________( excite ) while ________( make ) a speech in the park.
可以说明一下关于while前后动词怎么用吗?
问题解答：
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