I didn’t know which shirt was better the black one or the red one so I took them.A. allB

问题补充：

I didn’t know which shirt was better, the black one or the red one, so I took them.

A. all

B. each

C. none

D. both

答案：

A. all

B. each

C. none

(答案→)D. both

解析：句意：我不知道黑色和红色的衬衫那件更好，所以两件我都买下了。根据前一句话的意思可知，由于拿不准那件更好，所以买下了两件，表示两者都用both，all指三者以上中的全部，each指每一个，而none指三者以上中的那一个都不；故选D。