---Can i make a reservation for tommorrow's concert?
问题描述:
---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
答
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.