Question

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

A．it

B．them

C．her

D．that

Answer 1

A

考查形式宾语。It是形式宾语，代替真正的宾语to tell one from the other。句意：那两个女孩是如此的相似，以至于把她们区别开是很困难的。