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 velvety texture of the rose ______ so soft and smooth.
A．fell
B．is felt
C．was feeling
D．was felt
单项选择题
External dangers usually enforce ______ harmony and subordination.
A．inside
B．inner
C．internal
D．interior
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