The two men are so alike that strangers find difficult to tell one from the other.A. itB.

问题补充：

The two men are so alike that strangers find difficult to tell one from the other.

A. it

B. them

C. her

D. that

答案：

(答案→)A. it

B. them

C. her

D. that

解析：考查形式宾语。It是形式宾语，真正的宾语是to tell one from the other.句意：那两个人是如此的相似以至于陌生人发现要把他们分辨出来很难。