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The inventor ________ his belief upon his experiments done in the previous years.

[  ]

A.was based
B.has based
C.based
D.has been based

答案:C
提示:

base onbase up on表示“以……为基础,以……为依据”是固定的动词短语,该句为主动语态,in the previous years是表示过去的时间状语,故答案选C.这句意为“那位发明者把他的信念建立在他前几年多次实验的基础上”


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      Quickly
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      slowly
    3. C.
      freely
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      hit
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    2. B.
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    2. B.
      And
    3. C.
      But
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      For
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    2. B.
      might
    3. C.
      did
    4. D.
      need
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    2. B.
      hand
    3. C.
      nail
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    2. B.
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    4. D.
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    2. B.
      operates
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    4. D.
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