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 two brothers are very ______.
A．alike
B．the same
C．similarly
D．likely
单项选择题
The messenger rushed into the camp, his face ______ with sweat.
A．covers
B．covered
C．covering
D．was covered
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