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?

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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 weeks before 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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