---How did you work out the difficult chemistry problem?
--- I worked it out by ________.


  1. A.
    working with a group
  2. B.
    think very hard
  3. C.
    ask the teacher for help
  4. D.
    doing oneself
A
試題分析：句意：你是如何解決這個化學(xué)難題的？下文by是介詞，表示通過某種方式，后面接名詞或者動名詞作賓語，選項A表示通過小組合作，選項D語義不符，結(jié)合語境可知選A。
考點：非謂語動詞及短語辨析
點評：英語中原形動詞一般只能用作句子的謂語，不能用作介詞或者動詞的賓語等句子成分。解答此題還需要了解各個短語的基本含義及用法的不同，同時注意其表示多個含義的現(xiàn)象，然后結(jié)合語境選擇合適答案。
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