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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单项选择题
Mr. Brown did not tell us（）or not he’ll be leaving next week.

A. whether
B. if
C. either
D. weather
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
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