some students are busy( )the classroom after school. A.clean B.to clean C.cleaning.
还要说原因噢,.
人气：207 ℃ 时间：2019-11-12 06:17:03
解答
选C
解析：be busy doing sth.这是一个固定搭配,“忙于做某事”的意思
翻译：一些学生放学后忙着打扫教室
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