问题
选择题
4．My friend, David, was not used __________by air, so he felt unwell.
A．to traveling
B．to travel
C．traveling
D．Travel
答案
答案：A
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4．My friend, David, was not used __________by air, so he felt unwell.
A．to traveling
B．to travel
C．traveling
D．Travel
答案：A