问题
选择题
As we all know, ______ knowledge comes from _______ practice.
A．the; the
B．a; a
C．the ;×
D．×; ×
答案
答案：D
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As we all know, ______ knowledge comes from _______ practice.
A．the; the
B．a; a
C．the ;×
D．×; ×
答案：D