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  3. We didn t finish the work in time. You______us since you were there.

We didn t finish the work in time. You______us since you were there.

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问题 We didn t finish the work in time. You______us since you were there.
选项 A、might help
B、should help
C、could have helped
D、must have helped
答案C
解析 句意：我们没有及时完成工作，既然你在那里，你本可以帮助我们的。情态动词题。could have done表示“本来能做而实际没有做”，有时用来提出委婉的批评或表示后悔；而must have done则表示“对过去发生事情的肯定推测”，意为“一定，肯定”。根据句意可知，选C。
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