A
be busy doing sth 忙于做某事.
THE SMITHS 指一家人,謂語動(dòng)詞要用復(fù)數(shù).
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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
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
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原因
英語人氣：227 ℃時(shí)間：2020-03-28 05:32:50
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