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

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单项选择题
If the two teams were not so evenly matched, it would be easier to （） the outcome.

A．precede
B．expect
C．foretell
D．count
单项选择题
I would （） to help my sister.

A．go to great effort
B．go to great might
C．go to great strengths
D．go to great lengths
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