How can they learn anything useful ______ they spend all their spare time playing online games? A. w...
2023-01-05 07:36:40 33次 甘肃省2010届高三下学期第三次模拟考试试卷（英语） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
How can they learn anything
useful ______ they spend all their spare time playing online games?
A. while B.
unless
C. although D. when
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