单项选择题

They will be very thankful for ______ you can give them.

A．that
B．which
C．when
D．whatever
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单项选择题
I happened ______ when the telephone rang.
A．rut
B．to be out
C．being out
D．be out
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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