21.[1994全國(guó)] 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(dá)與過(guò)去事實(shí)相反時(shí)虛擬語(yǔ)氣的構(gòu)成——should have done

 


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