By using the credit card, people no longer need carry about large sums of money

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问题 By using the credit card, people no longer need carry about large sums of money while (travel) ______.

选项

答案 traveling

解析现在分词作状语。如果主句主语与分词是主动关系，就用现在分词；要是被动关系，就用过去分词。

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