【题目】The two girls are so alike that strangers find ______ difficult to tell them apart.
A. it B. them C. her D. That
在线课程【答案】A
【解析】
试题分析：考查代词的用法。句意：这两个女孩长得如此相像，以致于陌生人觉得很难把她们区分开。本句中it用在find后作形式宾语，真正的宾语是后面的动词不定式短语to tell one from the other。them，her，that等词均不能作形式宾语或形式主语。故选A。