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Look! The light in the room is still on. Mr. Liu          at work.

A．mustB．can’t beC．must beD．have to be

C

解析這題考查情態動詞表示猜測的用法：can’t be一定不是must be一定是，根據句意：看房間的燈還開著，說明劉先生一定還在工作。選C。

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