Because the shop all the T-shirts are sold at half price.A. has closed downB. closed dow

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：考查时态。Close down关闭；本题用现在进行时代替将来时，指代即将发生的事情。句意：因为商店即将被关闭，使用的T恤都半价出售。根据句意说明C正确。