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

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

【答案】A

【解析】句意:我聽(tīng)到了聲音,但不能使辨別他們?cè)谡f(shuō)什么。A. couldn't不能,語(yǔ)氣委婉;也可以是can’t的過(guò)去式,表示能力; B. wouldn't不會(huì),語(yǔ)氣委婉;C. mustn’t不應(yīng)該,語(yǔ)氣強(qiáng)烈,描述原則性問(wèn)題;D. shouldn’t不應(yīng)該,表示責(zé)任、義務(wù)、道義上等。根據(jù)句意可知,本句表示能力,且是一般過(guò)去時(shí)態(tài)。故選:A。

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