单项选择题

I do not doubt ________ he will appear soon.

A．that
B．whether
C．if
D．whatever
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单项选择题
Some people do not show much ________ in their choice of food.
A．discrimination
B．recognition
C．admission
D．indecision
单项选择题
They are bending with great ________ over the computer.
A．attempt
B．concentration
C．tolerance
D．devotion
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