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A
might help
B
should help
C
could have helped
D
must have helped
正确答案 :C
解析
【精析】C句意:我们没有及时完成工作,既然你在那儿,你本可以帮助我们的。情态动词题。该题考查的是情态动词后面跟完成式的用法。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则表示对过去发生的事情进行肯定的推测,意为“一定,肯定”。因此,根据句意应该选择C。
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