have to
must表示主观,have to表示客观.
We must help each other.
My sister is ill,my mother has to look after her.
客观上作业需要做完
Don't go out to play .You____finish your homework first.A must B have to
Don't go out to play .You____finish your homework first.A must B have to
英语人气：105 ℃时间：2019-08-21 23:18:37
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