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21.[1994全国] I told Sally how to get here, but perhaps I ________ for her.
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A. had to write it out |
B. must have written it out |
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C. should have written it out |
D. ought to write it out |
答案：C
提示：
提示：
题目考察表达与过去事实相反时虚拟语气的构成——should have done
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