How can they learn anything useful ______ they spend all their spare time playing online games? A. ...
2023-02-13 15:28:26 51次 甘肃省天水一中2010届高三三模 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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