题目内容
2. Bill used to collect stamps when he was in middle school.(改为否定句)
Bill________ _________ to collect stamps when he was in middle school.
2. didn't use / used not
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题目内容
2. Bill used to collect stamps when he was in middle school.(改为否定句)
Bill________ _________ to collect stamps when he was in middle school.
2. didn't use / used not