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The Smiths ________ their bags with their clothes in the sit

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The Smiths ________ their bags with their clothes in the sitting room.A.are busy filling B.is busy filling C.are busy to fill D.is busy to fill
原因
A
be busy doing sth 忙于做某事.
THE SMITHS 指一家人,谓语动词要用复数.
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