问题

“ On no account” , the teacher said, “________ open in day and night. ”
A:the door to the basement is to be left
B:e left
C:is the door to the basement to be left
D:was the door to the basement to be left
B:e left
C:is the door to the basement to be left
D:was the door to the basement to be left
正确答案是: