几个高二英语完成句子~
weshouldconsiderwhatuse___(能利用)suchabook
Allflights_____(被取消)becauseofthesnowstorm,manypassengerscoulddonothingbuttakethetrain(cancel)答案是“havingbeencanceled”为什么要用完成时啊
______(排队等了半个小时),theoldmansuddenlyrealizedhrhadleftthechequeinthecar.(wait)答案是“Waitinginthequeueforhalfanhour”为什么不用“Havingbeenwaiting?”
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