[答案] A
[解析] 题干的句子可以直译为:在我们一生中,学到某个教训是困难的,直到我们真正经历了这个教训为止。
[考题9] A good storyteller must be able to hold his listeners curiosity ____ he reaches the end of the story.
A. when B. unless C. after D. until
[答案] D
[解析] 讲故事的人应该始终抓住听众的好奇心,本题应选用表示到为止(跟主句里肯定形式的表延续性动作的谓语动词连用)的until 表示这一时间关系。
[考题10] I dont really work here; I ____ until the new secretary arrives.
A. just help out B. have just helped out
C. am just helping out D. will just help out
[答案] C
[解析] I dont really work here表明说话人只是临时前来帮忙,until the new secretary arrives表明说话人,工作到新秘书就任为止,本题应选用表示到为止(跟主句里肯定形式的表延续性动作的谓语动词连用)的until表示这一时间关系。
4. since引导的时间状语从句分析:
since引导的时间状语从句表示自从以来,其用法主要有两种:
(1) 现在完成时的主句+since引导的一般过去时态的时间状语从句。例如:He hasnt been home since he graduated. 他毕业后没回过家。// They have been friends ever since they were in grade school. 他们从小学起就一直是好朋友。// What have you been doing since I last saw you? 自我上次和你见面以后,你在做什么?
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