单项选择 适中0.65 引用1 组卷255
David still works hard ________ he has made great progress.
A.because | B.though | C.unless | D.if |
2020高三上·河北·学业考试
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________ technology could be the biggest leap forward, it could also be the most dangerous if it goes wrong.
A.Once | B.Because | C.Until | D.While |
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