How many more decades will have to pass _____ scientists succeed
分类: 英语（高升专）(c0003)发布时间: 2024-11-05 20:05浏览量: 0
How many more decades will have to pass _____ scientists succeed in providing a cure for cancer? A、when B、before C、since D、until 【正确答案】：B 【题目解析】：题考查的是固定句式。when当……时候；before在……之前；since自从；until直到。还要有多少年过去之后，科学家才能够成功地发现治疗癌症的方法