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 In time of serious accidents,______ we know some basic things about first aid, we can save lives.

  A. whether          B. until          C. if               D. unless

 

【答案】

 C

【解析】:根據(jù)題意可以看出,只有了解了基本的急救知識才能在事故發(fā)生的時候救人。Unless和if not相等,whether只有在表示是否這個意思的和if相同;until是直到一般多引導時間狀語從句。

【考點】:狀語從句的引導詞的選擇。

【易錯點】:因為if和whether有能夠通用的地方,容易錯選A;而且unless = if not有些同學沒有掌握好就錯誤的選擇了unless.

【備考建議】:狀語從句有時間、地點、方式、伴隨、原因、讓步、目的等等等幾種,對于每一種都要把其重點的引導詞的意義掌握好,其實掌握好漢語的狀語對英語也有好大的幫助。

 

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