“ On no account” , the teacher said, “ open in day and night. ”A. the door to the basemen

“ On no account” , the teacher said, “ open in day and night. ”
A. the door to the basement is to be left
B. the door to the basement was to be left
C. is the door to the basement to be left
D. was the door to the basement to be left

A. the door to the basement is to be leftB. the door to the basement was to be left(答案→)C. is the door to the basement to be leftD. was the door to the basement to be left解析：句意：--老师说：地下室的门绝不能日日夜夜开着。On no account“绝不”，如果放在句首的时候，谓语用部分倒装，be动词/情态动词/助动词放在主语前面，所以选C。

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