单项选择题

After a knock at the door, the child heard his mother’s voice （）him.

A.calling
B.called
C.being called
D.to call

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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

单项选择题

He likes to（）help from his classmates.

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