单项选择题

I happened ______ when the telephone rang.

A．rut
B．to be out
C．being out
D．be out
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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
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
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