They kept trying they must have known it was hopeless. 查看更多

 

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They kept trying _________ they must have known it was hopeless.

A. if         B. because       C. when   D. where

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They kept trying _____ they must have known it was hopeless.?

  A. if         B. because?    C. when       D. where??

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They kept trying _____ they must have known it was hopeless.?

  A. if         B. because?    C. when       D. where??

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They kept trying _____ they must have known it was hopeless.?

  A. if         B. because?    C. when       D. where??

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They kept trying _____ they must have known it was hopeless.?

  A. if     B. because?  C. when   D. where??

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