英语三级B级
填空题By using the credit card，people no longer need carry about large sums of money while(travel)_________。
参考答案：暂无进入在线模考
本题答案为：traveling。句意：使用了信用卡后。人们在旅游时再也不用随身携带大量现金了。本题考查的是非谓语动词。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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