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【题目】—I have trouble sleeping recently.

—You listen to light music to relax before going to bed.

A. must B. could C. mustn't D. couldn't

【答案】B

【解析】

句意:-最近我睡眠有些问题。-在睡觉之前你可以听点轻音乐来放松。must必须;could可以,能够;mustn’t禁止,不要;couldn’t不能。根据句意可知,这里是给对方提的建议,故应用could,表示“可以”。选B。

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