问题
选择题
It was not immediately obvious _____ water was to be fundamental to the development of life.
A．what
B．that
C．when
D．why
答案
答案：B
It作形式主语真正主语为that从句，that只起连接作用不做成分。句意：水注定会成为生命发展的基础还不明显。
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