单项选择题

Our slogan is "Quantity should never be increased at the ______ of quality."

A．price
B．cost
C．value
D．wealth
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单项选择题
When Jane fell off the bike, the other children ______ .
A．were not able to help laughter
B．could not help but laugh
C．could not help to laughing
D．could not help to laugh
单项选择题
The teacher has his students ______ a subject report every month.
A．to write
B．written
C．writing
D．write
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