It may be necessary to stop______in the learning process and go back to the difficult points in the ...
2022-10-01 14:40:48 67次 江苏省张家港市2016-2017学年高二下学期周考4英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It may be necessary to stop______in the learning process and go back to the difficult points in the lessons.
A. at intervals B. at random
C. at ease D. at length
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