My friend, David, was not used __________ by air, so he felt unwell.
A．to travelingB．to travelC．travelingD．travel
A
本題考查非謂語(yǔ)動(dòng)詞。be not used to是“不習(xí)慣于”的意思，to是介詞，后面接v.-ing形式。
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