the crazy fans___patiently for two hours,and they would wait till the movie star arrivedwere waiting had been waiting为什么

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thecrazyfans___patientlyfortwohours,andtheywouldwaittillthemoviestararrivedwerewaitinghadbeenwaiting

the crazy fans___patiently for two hours,and they would wait till the movie star arrivedwere waiting had been waiting为什么
the crazy fans___patiently for two hours,and they would wait till the movie star arrived
were waiting had been waiting
为什么

the crazy fans___patiently for two hours,and they would wait till the movie star arrivedwere waiting had been waiting为什么
had been waiting
had been waiting 表示从过去到现在一直在等
而 were waiting 只表示过去一直等待

had been waiting
过去完成进行时
疯狂的影迷已经耐心的在那里等了两个小时 它们将会继续等知道电影明星出现

had been waiting,过去完成进行时,一直在等待,并且还将继续等待下去
他们会继续等待电影明星出现

选后一个,意思是已经等了两个小时了,还会再等下去。
这里强调的是已经等了两小时了,应该用过去完成时。