单项选择题

In some countries traveling on public transport is a tremendous ______.

A．charge
B．amount
C．expense
D．sum
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单项选择题
______ your number, I would have telephoned you.
A．Had I
B．If I have
C．I had
D．I have
单项选择题
We were able to ______ different places in the city from the airplane.
A．look down upon
B．pick up
C．pick out
D．look for
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