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

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

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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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