如题所述
一群青蛙正在旅行的途中 (过去)
如果traveling后面还有介词,有不同的意思,比如through,A group of frogs were traveling through就是一群青蛙正在穿越,比如by,A group of frogs were traveling by,就是一群青蛙正乘着()旅行,等等。
如果traveling后面还有介词,有不同的意思,比如through,A group of frogs were traveling through就是一群青蛙正在穿越,比如by,A group of frogs were traveling by,就是一群青蛙正乘着()旅行,等等。
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