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情态动词15.He left yesterday,so he _______ in Beijing.A.may arri

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情态动词
15.He left yesterday,so he _______ in Beijing.
A.may arrive B.may have arrived C.must arrive D.arrives
为什么选B不选C?
怎么判断到底是肯定推断还是可能推断？
情态动词15.He left yesterday,so he _______ in Beijing.A.may arri
must是肯定的推断.
may是不是很肯定的推断,因此排除C.
句子又是想表达一个过去的事件,因此选B,may have done是对过去的不是很肯定的推测.
补充：用C肯定不对的理由还有一个,是因为must do肯定是对现在的推断.而句子是对过去的推断.四个答案只有B是对过去的推断.
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