高一英語：知識點總結Unit3-4(18)
【考例】 The American Civil War lasted four years the North won in the end.
A. after B. before C. when D. then
[考查目標] 時間狀語從句的引導詞選擇。
[答案與解析]B before 表示“直到……”。
4. Tree after tree went down, cut down by the water, which must have been three meters deep. 洪水想必深達三米，樹一棵接一棵地倒了，被洪水沖斷了。
該句中的must have been表示推測。例如：You look so tired. You must have stayed up last night.
情態動詞may，might，most.can，could常用來表示推測。may，might，must多用在肯定句中，can，could多用在否定句和疑問句中。may，might，must，can，could后接動詞原形表示對現在的推測;may，might，must，can，could后接have done。表示對過去的推測。例如：
You may be a professor. / She must have met a fairy.
【考例】This cake is very sweet. You ____ a lot of sugar in it.
A. should put B. could have put
C. might put D. must have put
[考查目標] 情態動詞表示推測。
[答案與解析] D 前文說蛋糕很甜，由此可知一定是糖
放多了。對于過去的動作的推測應使用have done的
結構，所以應在B、D之間做選擇，又因為could have
done表示本可以做而沒有做，所以選擇D。
5. ... she heard a loud noise，which grew to a terrible roar. ……她聽見了很響的聲音，接著就變成了可怕的隆隆轟鳴聲。
該句中的which引導非限制性定語從句。例如：He bought some reference books, which were all about science. 他買了許多的參考資料.都是有關理科的。
which 作為關系代詞.既可以引導限制性定語從句，也可以引導非限制性定語從句。例如：The train which left for Beijing pulled in on time. 前往北京的火車按時進站了。His dog, which was now very old, became ill and died.他的狗，現在老了，生病死了。
(責任編輯：康彥林)
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