— Can I speak to Mr. Liu. Please? — Sorry but he’s busy ______ his guests now.

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问题 — Can I speak to Mr. Liu. Please?    — Sorry but he’s busy ______ his guests now.

选项 A、to meet
B、with
C、meeting

答案C

解析 此题考查“be busy doing”的固定用法,表示“忙于……”。选项A为动词不定式,不符合语法,选项B“with”与busy搭配应为“be busy with sth.”而“his guest”是人不是物,所以不能选。故正确选项为C。
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