As we all know knowledge comes from practice.A. the; theB. a; aC. the ;×D. ×; ×

问题补充：

As we all know, knowledge comes from practice.

A. the; the

B. a; a

C. the ;×

D. ×; ×

答案：

A. the; the

B. a; a

C. the ;×

(答案→)D. ×; ×

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