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题目
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They kept trying _____ they must have known it was hopeless.
A.ifB.because
C.whenD.where

答案
C
解析
考查连词。if 如果,是否;because因为;when既然,当……时;where在哪儿。句意:考虑到他们一定知道这是没有希望的,他们坚持继续尝试。选C。
核心考点
试题【They kept trying _____ they must have known it was hopeless.A.ifB.becauseC.whenD】;主要考察你对连词等知识点的理解。[详细]
举一反三

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