i must____(clean) the classroom.

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imust____(clean)theclassroom.imust____(clean)theclassroom.imust____(clean)theclassroom.must是情态动词,情态动

i must____(clean) the classroom.
i must____(clean) the classroom.

i must____(clean) the classroom.
must是情态动词,情态动词后面接动词的原形,所以应该填clean即可.

must是情态动词,情态动词后面接动词的原形,所以应该填clean。 赞同

我必须打扫教室

原型 clean