问题补充:
Because the shop , all the T-shirts are sold at half price.
A. has closed down
B. closed down
C. is closing down
D. had closed down
答案:
A. has closed down
B. closed down
(答案→)C. is closing down
D. had closed down
解析:由all the T-shirts are sold at half price可知,这家商店还没有关闭,但准备将要关闭,所以选C,用现在进行时表示最近的打算。