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【题目】2018年上海崇明二模I heard the voices, but______make our(辨别) what they were saying.

A. couldn't B. wouldn't C. mustn’t D. shouldn’t

【答案】A

【解析】句意:我听到了声音,但不能使辨别他们在说什么。A. couldn't不能,语气委婉;也可以是can’t的过去式,表示能力; B. wouldn't不会,语气委婉;C. mustn’t不应该,语气强烈,描述原则性问题;D. shouldn’t不应该,表示责任、义务、道义上等。根据句意可知,本句表示能力,且是一般过去时态。故选:A。

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