---Sorry, Professor Smith. I didn’t finish the assignment yesterday.
---Oh, you___________ have done it as yesterday was the deadline.
A．mustB．mustn’tC．shouldD．shouldn’t
C
本題考查的是虛擬語(yǔ)氣。此處表示和過(guò)去事實(shí)相反的情況，應(yīng)該用should + have + 過(guò)去分詞。本來(lái)應(yīng)該做，而未做。選C。
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