摘要：1663] At present pupils are kept a lot of exercises not only in school but also at home. [译文] 现在学生们被忙于做许多练习题.无论在学校还是在家里了. A. on doing B. busy doing C. to do D. done [答案及简析] B. keep sb. busy doing sth. 使某人忙着干某事.

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