A. turned up B. turned down C. turned in D. turned out
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
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
