问题
选择题
I am sure ____ he did is wise.
A．that
B．about that
C．of that
D．that what
答案
答案：D
考查从句关系词的选择。根据句型可知此处that what he did is wise是宾语从句，从句中what he did 作is wise 的主语，在主语从句what he did 中缺少did的宾语，所以选择what
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