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

提问时间:2021-04-01

答案
省略句,其实后面是unless we were allowed to do it(直到我们被允许做某事),后面的do it省略,就是动词不定式的省略形式,所以选C
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