【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？——對不起，恐怕不行。情態(tài)動詞could表示請求允許時比用can語氣更委婉一些，此時could不是過去時態(tài)；答語表示拒絕，只能用can't，所以答案是A。

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