问题
选择题
Water, which seems to be so simple and common, is ______ makes life possible.
A．that
B．which
C．what
D．where
答案
答案：C
题目分析：:what引导表语从句且作makes的主语。句意：水，看似简单普通却是使生命成为可能的东西。选C。
点评：what引导表语从句，在句中起连接作用，也充当主宾表。
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