单项选择题

Since we have never been here before, we do not know which bus().

A. should we take
B. to be taking
C. to take
D. should take

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单项选择题
Since nobody is answering the phone, they().

A. should have left
B. must have left
C. need have left
D. can have left
单项选择题
Not until the bell had rung () the classroom in a hurry.

A. he came into
B. did he come into
C. he has come into
D. has he come into
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