Because the shop , the T-shirts 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：T桖杉正以半价销售，这说明商店还没关张，故选C项，用现在进行时表示将来的动作。