How long do you think it will be _______ scientists succeed in providing a cure for cancer?
A．whenB．a(chǎn)fterC．sinceD．before
D

試題分析：句意:你認(rèn)為還需多長時間科學(xué)家就能成功提供治癌癥的方法？when當(dāng)……時候；after在……之后；since自從；it will be some time before...再過多長時間就。根據(jù)句意故選D。
點評：本題難度適中。固定句式是近幾年高考常出現(xiàn)的一個考查項目，高中階段的一些句式不是很多，提醒考生在平時多加注意它們的用法及意義。
即學(xué)即練: How long is it _______ we visited your mother?
A. when       B. after       C. since      D. before
解析：C。句意：自從我們看望你母親以來到現(xiàn)在有多長時間了？
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