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【题目】The teacher spent a long time _____ the problem to the boys after class. (解释)

【答案】explaining

【解析】

句意:下课后,老师花费了很长时间向孩子们解释了这道难题。
解释:explainspend...(in) doing sth. 花费……做某事。此处动名词作宾语,介词in可省略。故答案为explaining

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