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
______ did the goalie catch the goal that the spectators rose up to cheer him like sea waves.
A．Such amazement
B．So amazing
C．So amazingly
D．In such amazement
单项选择题
External dangers usually enforce ______ harmony and subordination.
A．inside
B．inner
C．internal
D．interior
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