2. 专升本
  3. 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?

admin2016-10-25  54
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。
转载请注明原文地址:https://kaotiyun.com/show/jjHC777K
本试题收录于： 英语题库普高专升本分类
0

英语

普高专升本

相关试题推荐
随机试题
最新回复(0)