We were told not to touch the equipment in the laboratory unless ________.
A．allowed to doB．allowing to doC．allowed toD．allowing to
C
考察狀語從句的省略。Unless后面省略了we were.不定式符號to后面省略了touch the equipment.當狀語從句的主語和主句主語一致的時候，可以把主語和系動詞be一起省略.完整的形式應該是：unless we were allowed to touch the equipment.句意：我們在告知在實驗室里不要碰任何東西，除非我們被允許。
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