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专升本
How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?
How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?
admin
2014-05-25
74
问题
How many more decades will have to pass ______ scientists succeed in providing a cure for cancer?
选项
A、when
B、since
C、before
D、until
答案
C
解析
before常可用于将来时态,表示“才;就”,如:It will be several weeksbefore you are used to the new life in college.几个星期后你就会适应大学里的新生活了。A.when一般不与将来时态连用。B.since常与现在完成时连用。D.until直到,用在此处意义不符。
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本试题收录于:
英语题库普高专升本分类
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英语
普高专升本
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