Because of exchange rates, many air travelers hesitate to book flights______in other countries.

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问题 Because of exchange rates, many air travelers hesitate to book flights______in other countries.

选项 A、origin
B、originate
C、will originate
D、originating

答案D

解析单词形态：分词1．句子中已有动词hesitate， B选项originate和C选项will originate是动词，因而排除。2．空格内应填入一个形容词修饰名词fights，因此(D)originating为正确选项。

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