单项选择题

Whether or not their business will succeed ______ their most concern.

A．have become
B．are
C．has become
D．to become
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单项选择题
I should like to ______ my thanks to you for your kindness.
A．extend
B．intend
C．pretend
D．attend
单项选择题
We were lost at sea, at the ______ of wind and weather.
A．service
B．expense
C．cost
D．mercy
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