题目内容

【题目】Tom’s parents look _________. Maybe they ______ he didn’t pass the exam.

A. happy; has knownB. happy; have known

C. unhappy; has knownD. unhappy; have known

【答案】D

【解析】

句意：汤姆的父母看起来不高兴。也许他们知道他考试不及格。根据Maybe they ______ he didn’t pass the exam. 也许他们知道他考试不及格。可知，汤姆的父母看起来应该是不高兴的。排除A/B；又因为句子的主语是they，因此助动词用have。故选D。

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