M: DO WE NEED TO GET THE CONCERT TICKET IN ADVANCE?
w: THERE MAY BE SOME FOR SALE AT THE DOOR AT THE HIGHER PRICE.
A. THERE ARE NONE LEFT.
B. THEY ARE TOO EXPENSIVE.
C. THEY MIGHT BE AVAILABLE AT THE CONCERT.~answer
D. THEY NEED TO BE PURCHASED IN ADVANCE.
為什麼答案不是d呢