How long do you think it will be _______ scientists succeed in providing a cure for cancer?
| A．when | B．after | C．since | D．before |
D
解析试题分析：句意:你认为还需多长时间科学家就能成功提供治癌症的方法？when当……时候；after在……之后；since自从；it will be some time before...再过多长时间就。根据句意故选D。
考点：考查固定句式的用法。
点评：本题难度适中。固定句式是近几年高考常出现的一个考查项目，高中阶段的一些句式不是很多，提醒考生在平时多加注意它们的用法及意义。
即学即练: How long is it _______ we visited your mother?
A. when B. after C. since D. before
解析：C。句意：自从我们看望你母亲以来到现在有多长时间了？
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