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Science is ________ difficult for some students ________ understand.


  1. A.
    too; to
  2. B.
    so; that
  3. C.
    enough; to
  4. D.
    such; that
A
本题考查too…to…句型,意思是“太……而不能……”;B、D项不能选用是因为that后应接从句;而C项不能选用是因为enough应放在形容词之后。
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