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Why don’t和Why not有啥区别?

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Why don’t和Why not有啥区别?
( ) 2.--- Our teacher wouldn’t give us the answers ___ the question directly.
  --- _____ work them out by ourselves?
  A.of,Why not B.to,Why don’t
  C.of,What about D.to,Why not
以此为例!
Why don’t和Why not有啥区别?
选D
"the answer to the question"是固定搭配 ".的答案"
"Why don't"之后要接主语人比如you,we,she,he,they等.
"Why not"之后接动词原形
而“work"是动词原形
所以选D