单项选择题

The professor warned tie students that on no account（）use mobile phones in his class.

A. should they
B. they should
C. dare they
D. they dare

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单项选择题

He likes to（）help from his classmates.

A.understand
B.ask for
C.smileat
D.check

My father felt very（）(depress) when he was out of work for a month.

答案： heard