Because the shop ，all the Tshirts are sold at half price.
A. has closed down
B. closed down
C. is closing down
D. had closed down
网友回答
A. has closed down
B. closed down
(答案→)C. is closing down
D. had closed down
解析：考查时态。句意：因为这个商店即将倒闭，所以所有T恤半价出售。结合语意可知，此处应用现在进行时表示将来，故选C。