单项选择题

______ do their homework carefully.

A. No all the students
B. Not all the students
C. None the students
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单项选择题
He took a job in his spare time in order to ______ some experience.
A. win
B. gain
C. check
单项选择题
—where is Tom —He's left a ______ saying that he has something important to do.
A. excuse
B. sentence
C. message
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