Question

The two girls are so alike that strangers find ________ difficult to tell one from the other.                                                                                                                                                                        (2011·山东，24)

A．it B．them

C．her  D．that

Answer

【解析】 A

解析 句意为：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。