【題目】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:湯姆的父母看起來不高興。也許他們知道他考試不及格。根據(jù)Maybe they ______ he didn’t pass the exam. 也許他們知道他考試不及格。可知,湯姆的父母看起來應(yīng)該是不高興的。排除A/B;又因?yàn)榫渥拥闹髡Z(yǔ)是they,因此助動(dòng)詞用have。故選D。

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