How many more decades will have to pass______ scientists succeed in providing a cure for cancer?

admin2016-11-13  37

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/uvHC777K
本试题收录于: 英语题库普高专升本分类
0

最新回复(0)