When  _______ homework , you should be careful .


  1. A.
    do
  2. B.
    to do
  3. C.
    doing
  4. D.
    done
C
試題分析：考查省略句：英語中主從句的主語一致時，可以省略從句的主語和be動詞，when doing =" when" you are doing，句意是;當(dāng)做作業(yè)的時候要小心。選C。
考點(diǎn)：考查從句的省略式
點(diǎn)評：做這種題目可以用還原法做題，先把主語和be動詞加上，再判斷是主動還是被動。句意通順才行。
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