must not 后面加do doing 还是to do?

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must not 后面加do doing 还是to do?
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must not 后面加do doing 还是to do?
must not 后面加do doing 还是to do?

must not 后面加do doing 还是to do?
直接加do must 是情态动词 后面只能接动词原形

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