问题
选择题
＿＿＿used to be thought that the earth was square.
A．He
B．What
C．It
D．That
答案
答案：C
it作形式主语，代替真正主语that从句。
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＿＿＿used to be thought that the earth was square.
A．He
B．What
C．It
D．That
答案：C
it作形式主语，代替真正主语that从句。