问题
选择题
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
答案
答案：C
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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
答案：C