It was not until the beginning of the twentieth century ______ to explore space.

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• 1I'm wondering in which play _____ your brother will appear?  I've no idea of the information of theperformance.

  A.that is where

  B.this is when

  C.it is where

  D.it is that

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• 2I don't mind her criticizing me, but _____ is how she does it that I object to.

  A.it

  B.that

  C.this

  D.which

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• 3When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seemed to me that there are two causes.

  A.why it does

  B.what it does

  C.what it is

  D.why it is

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• 4— Well. I do think the rabbit is a beautiful, gentle animal which can run very fast. — ______.

  A.So it is

  B.So is it

  C.So does it

  D.So it does

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• 5Jane won't join us for dinner tonight and ________.

  A.neither won't Tom

  B.Tom won't either

  C.Tom will too

  D.so will Tom

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• 6— What did he want to know, Jack?— _______ that we would have the picnic on Sunday.

  A.what it was

  B.when was it

  C.whether it was

  D.where it was

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• 7It was _____ back home after the experiment.

  A.not until midnight did he go

  B.until midnight that he didn't go

  C.not until midnight that he went

  D.until midnight when he didn't go

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• 8It was only when I entered high school _____ the importance of English.

  A.did I realize

  B.realized I

  C.that did I realize

  D.that I realized

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• 9It was in this house _____ he was born and grew up.

  A.that

  B.where

  C.which

  D.when

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• 10Who was _____ that called him and told him to buy some milk?

  A.that 　　　

  B.it 　

  C.what 　　　

  D.this

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