We were told not to touch the equipment ...

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

C 【解析】试题分析：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 考点：考查省略

考点分析：

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