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When I went to their house, there was no light on. They at home.A.can’t beB.coul

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When I went to their house, there was no light on. They at home.A.can’t beB.coul

When I went to their house, there was no light on. They _____ at home.

A.can’t beB.couldn’t be
C.can’t have beenD.mustn’t have been

试题答案

C

解析试题