She always wears __white T-shirt and __black trousers.A.a;a B.a;an C./;/ D.a;/

问题描述:

She always wears __white T-shirt and __black trousers.A.a;a B.a;an C./;/ D.a;/

D.
都是泛指,前面是可数单数,a
后面的是复数,不填则是泛指