题目内容

【题目】—You look so tired. You________ late last night.

—Yes. I had to to do an important report and stayed up till I completed it.

A.should sleepB.must sleep

C.should have sleptD.must have slept

【答案】D

【解析】

考查情态动词。句意:—你看起来很累。你昨晚一定睡得很晚。 —是的。我必须完成一份重要的报告,而且要熬夜完成。根据回答“yes”以及后面的具体解释可知,第二个人肯定了第一个人的推测。表肯定推测,应用must。且根据last night可知,这是对过去的推测,应用must have done。should have done表虚拟,意为“本应该做某事”。故选D。

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