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20.Carl hopes to win the tennis game one day.That is    he has been practicing hard.(  )
A.whyB.howC.becauseD.where

分析 Carl 希望有一天赢得这场网球比赛.这是他一直都在刻苦训练的原因.

解答 答案:A
分析句子结构可知,由于此处用在了系动词is之后,故本句为表语从句;在表语从句中,连接副词 why作原因状语;后面跟的表示结果"(为什么)…的原因";how 作方式状语;because作原因状语,后面跟的表示原因:"那是因为…";where作地点状语;根据句意可知;此处表示:他一直都在刻苦训练的原因;故选A

点评 本题考查了表语从句的用法.在做本题时,首先通过分析句子结构,判断该句为表语从句;其次应根据句意并结合各连接词的用法,选出正确答案;另外,还应记住That is why (后面跟的表示结果"(为什么)…的原因")与 That is because(后面跟的表示原因:"那是因为…")的用法区别.

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