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are you sure you have to?it is been very late.

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are you sure you have to?it is been very late.
.——Are you sure you have to?It's been very late.——I don't know ___ I can do it if not now 选项:where,why,when,how
亲,答案选:how,表方式,意味“如何”.

理由:主句I don't know 后面的从句后半部分为:I can do it ,主谓宾齐全,
所以只能选择表示方式的how.

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