We were told not to touch the equipment in the laboratory unless ________. A．allowed to do B．allowin...
2022-12-25 13:31:31 155次 2012-2013学年辽宁省五校协作体高二上学期联合竞赛英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
We were told not to touch the equipment in
the laboratory unless ________.
|
A．allowed to do
|
B．allowing to do
|
|
C．allowed to
|
D．allowing to
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本题链接：
