题目内容

They are good friends.      is no wonder that they know each other so well.
A．ThisB．ThatC．ThereD．It
D

试题分析：通过分析句子结构，可知这个句子中包含一个主语从句，而主语从句位于句末，故需要It作形式主语，只有It可以作形式主语。
点评：作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的真正主语，概括起来会有如下情况：不定式作主语、动名词作主语和名词从句作主语。
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