when l came into the room,they_were planning_to __go on a trip_.为什么填were planning和go on atrip.中文原因

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when l came into the room,they_were planning_to __go on a trip_.为什么填were planning和go on atrip.中文原因
when l came into the room,they_were planning_to __go on a trip_.为什么填were planning和go on a
trip.中文原因

when l came into the room,they_were planning_to __go on a trip_.为什么填were planning和go on atrip.中文原因
go on a trip 去旅行 固定短语
整个句子是一个过去进行时 指过去某一时间 正在做某事
当我走进房间时 他们正在计划去旅行

注意前面是过去时态,后面也应该用过去时态,又因为进房的时候,他们正在计划去旅游,所有整个后面应该是过去进行时,所以用were planning,plan to do sth.计划做某事,所以用go on a trip,go on a trip是固定短语,去旅游。