题目内容
句型转化
Martin used to give his mother a lot of trouble．(改为否定句)
Martin ________ ________ to give his mother a lot of trouble．
答案：didn't/used use/not
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题目内容
句型转化
Martin used to give his mother a lot of trouble．(改为否定句)
Martin ________ ________ to give his mother a lot of trouble．