单项选择题

I am used ______ by air and only on one occasion have I ever felt frightened.

A．to travel
B．to traveling
C．traveling
D．to have traveled
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单项选择题
The success of the project stands ______ management's support of it.
A．down
B．by
C．for
D．on
单项选择题
Everybody seems to enjoy ______.
A．himself
B．herself
C．themselves
D．ourselves
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