21.[1994全國] I told Sally how to get here, 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
提示：

題目考察表達與過去事實相反時虛擬語氣的構(gòu)成——should have done

 


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