It is well-known to us all that knowledge is treasure, but practice is key to it.A. a, ∕

发布时间：2020-08-16 10:45:42


It is well-known to us all that knowledge is      treasure, but practice is      key to it.
A. a, ∕
B. a, the
C. the, the
D. ∕ , the

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A. a, ∕
(答案→)B. a, the
C. the, the
D. ∕ , the
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