They talked and laughed ______ their trip.A.in B.on C.at 为什么要用B ,不理解

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Theytalkedandlaughed______theirtrip.A.inB.onC.at为什么要用B,不理解Theytalkedandlaughed______theirtrip.A.inB.

They talked and laughed ______ their trip.A.in B.on C.at 为什么要用B ,不理解
They talked and laughed ______ their trip.
A.in B.on C.at
为什么要用B ,不理解

They talked and laughed ______ their trip.A.in B.on C.at 为什么要用B ,不理解
on their trip 在他们的旅途中,是固定用法,就像on one's way to.在去.的路上一样

on one's trip在旅途中

B, 短语on their trip