選項(xiàng)應(yīng)該是2,
詞組結(jié)構(gòu)為 be busy doing sth,忙于做某事,這是一個(gè)基礎(chǔ)結(jié)構(gòu),也屬于習(xí)慣用法
we were busy ____the classroom when mr wang came in 1.with clean 2.cleaning 3.to clean 4.for
we were busy ____the classroom when mr wang came in 1.with clean 2.cleaning 3.to clean 4.for
其他人氣：708 ℃時(shí)間：2020-03-27 01:22:56
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