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. since D. that [考題7] It was some time ____ we realized the truth. A. when B. until C. since D. before 3. till和 until 引導的時間狀語從句分析:till和 until這兩個詞作連詞和介詞時的意義和用法相同,一般可以換用(放在句首時通常用until的形式,till在口語中更為常見)。例如:Walk till you e to a white house. 一直走到一座白房子為止。 We didn’t discuss the problem until he came back. 我們一直等到他回來后才討論問題。 [考題8] It is difficult for us to learn a lesson in life ____ we’ve actually had that lesson. A. until B. after C. since D. when [考題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] 講故事的人應該始終抓住聽眾的好奇心,本題應選用表示“到……為止”(跟主句里肯定形式的表延續(xù)性動作的謂語動詞連用)的until 表示這一時間關系。 [考題10] I don’t 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 don’t really work here”表明說話人只是臨時前來幫忙,“until the new secretary arrives”表明說話人,工作到新秘書就任為止,本題應選用表示“到……為止”(跟主句里肯定形式的表延續(xù)性動作的謂語動詞連用)的until表示這一時間關系?! ?. since引導的時間狀語從句分析: since引導的時間狀語從句表示“自從……以來”,其用法主要有兩種: (1) 現在完成時的主句+since引導的一般過去時態(tài)的時間狀語從句。例如:He hasn’t been home since he graduated. 他畢業(yè)后沒回過家。// They have