I am used ______ by air and only on one occasion have I ever felt frightened.

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问题 I am used ______ by air and only on one occasion have I ever felt frightened.

选项 A、to travel
B、to traveling
C、traveling
D、to have traveled

答案B

解析此题考查固定用法。be used to后面用名词或者动名词，表示“习惯于…”。

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专业英语四级

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