问题
选择题
The two girls are so alike that strangers find________difficult to tell one from the other.
A．it
B．them
C．her
D．that
答案
A
题目分析：句意：这两个女孩是如此的相似,以至于陌生人很难区分他们。it 是形式宾语，to tell one from the other是真正的宾语。故选A。
考点：