be able to 是能夠做某事,must是必須,
這里是過(guò)去時(shí)態(tài),所以不能用can和may
結(jié)合語(yǔ)境應(yīng)該是選B
he asked nothing because he was able to understand what they had talked about.
he asked nothing because he was able to understand what they had talked about.
He asked nothing because he was able to understand what they had talked about.
A.must B.was able to C.can D.may
He asked nothing because he was able to understand what they had talked about.
A.must B.was able to C.can D.may
英語(yǔ)人氣：761 ℃時(shí)間：2019-11-24 10:57:15
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