We must have someone ___ the room.填clean up,为什么不是to clean up

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We must have someone ___ the room.填clean up,为什么不是to clean up
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We must have someone ___ the room.填clean up,为什么不是to clean up
We must have someone ___ the room.
填clean up,为什么不是to clean up

We must have someone ___ the room.填clean up,为什么不是to clean up
have sb do sth=make sb do sth 让/使 某人做某事 不需要也不应该加to

have sb. do sth.
不定式的to省略,我们老师重点讲过这个。

clean up Have ab. Do ath.