七年级英语预备课程《与课堂同行>She must use a plastic bag.(改为否定句)She ___ ___use a plastic bag.

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七年级英语预备课程《与课堂同行>
She must use a plastic bag.(改为否定句)
She ___ ___use a plastic bag.

need not.
must的否定句用needn't(*^__^*)