You _______ late for yesterday’s class meeting, as it was so important.
A．couldn’tB．shouldn’t beC．mustn’t have beenD．oughtn’t to have been
D
考查情態(tài)動詞。oughtn’t to have done =" shouldn’t" have done本不應(yīng)當(dāng)做。句意：你昨天班會本應(yīng)當(dāng)遲到，因為它很重要。
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