问题
选择题
The two girls are so alike that strangers find ________ difficult to tell one from the other.
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答案
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。