【題目】— ______ I sing here, Jim?— Sorry, I'm afraid you ______.
A.Could; can't
B.Can; couldn't
C.Can; may not
D.Could; couldn't

【答案】A
【解析】句意：——我可以在這兒唱歌嗎，吉姆？——對(duì)不起，恐怕不行。情態(tài)動(dòng)詞could表示請(qǐng)求允許時(shí)比用can語(yǔ)氣更委婉一些，此時(shí)could不是過(guò)去時(shí)態(tài)；答語(yǔ)表示拒絕，只能用can't，所以答案是A。

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