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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
