They kept trying _____ they must have known it was hopeless.A．ifB．becauseC．whenD
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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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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。 |
举一反三
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