He didn't know________he could do to help the old man.


  1. A.
    whether
  2. B.
    when
  3. C.
    what
  4. D.
    how
C
分析:空格詞引出賓語從句,he是主語,could do是謂語,do是及物動詞,現(xiàn)在缺少其賓語,按劃線提問的原則是變成了what,作為賓語從句的引出詞。句意是“他不知道能做什么來幫助這老人”。(延伸)1)以特殊疑問詞引出的賓語從句來源于特殊疑問句,此處如果是he自己問自己的話,他的話是:What can I do to help the old man?2)賓語從句的引出詞有三種類型:that,whether或if,wh-特殊疑問詞。判斷用哪一種的要點是:賓語從句的成分和意思都完整,和主句的配合上不存在“不肯定”“拿不準”情況時,用that;賓語從句的成分和意思都完整,但在和主句的配合上存在“不肯定”“拿不準”情況時,用whether或if(是否);賓語從句的成分有缺少,把所缺少的成分按劃線提問的方式來決定所用的特殊疑問詞,以此作為賓語從句的引出詞;如果賓語從句的主要成分已經(jīng)完整,就看意思上有什么需要添加的(即在狀語方面進行考慮),如時間、地點、方式、原因等,從而也按對劃線部分提問的方式來決定用什么特殊疑問詞來作為賓語從句的引出詞。
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