Battery-operated slippers are used________seeing in the dark． A. to B. as C. by D. for
2022-10-11 07:36:20 108次 2018年秋九年级（人教版）英语课时同步练习卷Unit5 Section B 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Battery-operated slippers are used________seeing in the dark．
A. to
B. as
C. by
D. for
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