We were told not to touch the equipment in the laboratory unless .A. allowed to do B. allo

发布时间：2020-08-17 00:03:06

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

网友回答

A. allowed to do
B. allowing to do
(答案→)C. allowed to
D. allowing to
解析：考查省略，后面的句子省略了we were…touch the equipment in the laboratory，句子意思“我们被告诉不能碰实验室的设备除非我们被允许碰”，所以选C
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