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        1. (2013·貴州模擬)Tom, clean up the broken glass   someone walks on it.
          A.sinceB.whenC.beforeD.a(chǎn)s
          選C?疾闋钫Z從句。句意: 湯姆, 把碎玻璃收拾干凈, 以防有人踩上。此處before意為“以防; 免得”, 引導時間狀語從句。
          【變式訓練】
          ①(2013·重慶模擬)—Hello, can I speak to Mr. Smith?
          —I’m sorry, but it is 3 weeks   he worked here.
          A. before          B. since           C. after           D. while
          選B?疾闋钫Z從句。句意: ——喂, 我可以跟史密斯先生通電話嗎? ——很抱歉, 他不在這里工作已經(jīng)有三周了。此處考查句型: It is +一段時間+since從句(使用一般過去時)。此處since從句使用的是延續(xù)性動詞, 表示該動作停止到現(xiàn)在多久了。
          ②It was nearly an hour   the sleeping pill   effect.
          A. when; took              B. before; took
          C. since; takes             D. before; would take
          選B?疾闋钫Z從句和時態(tài)。句意: 過了幾乎一小時那片安眠藥才起作用。此處before引導一個時間狀語從句, 句型為: It was some time before. . . did. . . 表示“過了多久才……”。
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