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
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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
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
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.
祝学习进步,请采纳,谢谢!
when
when
——你确定你现在必须要做么？已经很晚了！
——如果我现在不做我不知道什么时候才能做。
表示时间，用when。
.——Are you sure you have to? It's been very late.你确定你必须做？已经很晚了。
——I don't know _WHEN__ I can do it if not now 如果我现在不做，我不知道什么时候才能做了
when when