519.Why are all the shoes sold at half price?
The shop ________.
A.has closed down
B.closed down
C.is closing down
D.had closed down
520.I'll come to see your performance at 9 tomorrow evening.
I'm sorry.By then,my performance ____ and I ___ reporters in the meeting room.
A.will end;will meet
B.will have ended;will be meeting
C.will be ended;am going to meet
D.is to end;will meet
519.答案是C;此题指这家店快要关闭。
520.答案是B;此题中then指9 tomorrow evening。By+将来时间状语，谓语动词用将来完成时；第二空表示在那时将正在与记者见面。
