---Can i make a reservation for tommorrow's concert?----Sorry,all the seats_____by 9:00 this morning.A.had been reserved B.were reserved C.have been reserved D.would be reserved

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---Canimakeareservationfortommorrow''sconcert?----Sorry,alltheseats_____by9:00thismorning.A.hadbeenre

---Can i make a reservation for tommorrow's concert?----Sorry,all the seats_____by 9:00 this morning.A.had been reserved B.were reserved C.have been reserved D.would be reserved
---Can i make a reservation for tommorrow's concert?
----Sorry,all the seats_____by 9:00 this morning.
A.had been reserved B.were reserved C.have been reserved D.would be reserved

---Can i make a reservation for tommorrow's concert?----Sorry,all the seats_____by 9:00 this morning.A.had been reserved B.were reserved C.have been reserved D.would be reserved
by 9:00 this morning.
有by啊,这一般是完成时的标志啊,你要理解这句话的意思.做多了题的话就会懂的.

A是过去完成时,这些座位是过去就已经被预定完了的,选A比选B妥当。

sad