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"I told Sally how to get there,but perhaps I ________ for he

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"I told Sally how to get there,but perhaps I ________ for her."
A.had to write it out
B.must have written it out
C.should have written it out
D.ought to write it out
答案C
本句译为“我告诉了Sally怎样去那儿,但也许我本应该替她写下来(实际上没写).这是表示“本应该做而实际上未做”,该用should/ought to+have done.