________ this kind of chemical is better has not been tried．

试卷相关题目

• 1It remains a question_______we can finish the project in such a short time.

  A.what

  B.that

  C.how

  D.when

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• 2________ worried her was what she had done might make things worse．

  A.What

  B.What

  C.What

  D.Who

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• 3In Britain, ________ are called“private schools”are not owned by privates at all．

  A.as

  B.which

  C.what

  D.that

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• 4_________ expects a good mark in the exam is supposed to make great efforts in their daily learning．

  A.The one

  B.Anyone

  C.Whoever

  D.Who

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• 5 ______ is known to all is that the Diaoyu Islands have belonged to China since ancient times.

  A.As

  B.It

  C.What

  D.That

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• 6________ life began on the earth is one of the biggest puzzles to scientists．

  A.How

  B.What

  C.Where

  D.That

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