单项选择题

He must have overslept, or he（）then.

A．would have been here
B．had to be here
C．should be here
D．would be here

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单项选择题
The teacher demanded that the students（）from speaking while the class is in progress.

A．avoid
B．refrain
C．stop
D．control
单项选择题
The daughter（）the subject, so the mother reminded her to keep to the point.

A．was straying away
B．was staying off
C．as stemming from
D．as straying from
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