As we all know, ______ knowledge comes from _______ practice.A.the; theB.a; aC.

As we all know, ______ knowledge comes from _______ practice.A.the; theB.a; aC.

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

答案
D
解析

举一反三
How I envy you _______ your good luck!
A.inB.ofC.toD./

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It is pleasant to play ______ game of ______ table tennis ______ summer afternoon.
A.a...the...on theB.a...X...on aC.the...the...in theD.the...X...in a

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What ______ heavy snow. Let"s go out for a walk in ______ snow, shall we?
A.X...the B.a...the C.a...X D.X...X

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In America, if__________friend has invited you to drop by anytime, it is__________best to call before visiting to make sure it is convenient for him.
A.a; aB.a; 不填C.the; aD.the; 不填

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According to a new study by a British’s university , learning ______ second language can lead to ________ increase in your brain power.  
A.a ; theB.不填;theC.a ;anD.the ;an

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