They kept trying _____ they must have known it was hopeless. A．if B．because C．when D．where
2023-01-03 09:09:49 69次 高考英语陷阱题总结归纳状语从句 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
They kept trying _____ they must have known
it was hopeless.
|
A．if
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B．because
|
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C．when
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D．where
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