The twins looked exactly the same.Even I couldn't one from the other.A. speakB. talkC. sa

问题补充：

The twins looked exactly the same.Even I couldn one from the other.

A. speak

B. talk

C. say

D. tell

答案：

A. speak

B. talk

C. say

(答案→)D. tell

解析：tell与 can could ,be able to一起用,意为:判别, 分辨.