When  _______ homework , you should be careful .
A．doB． to doC．doingD． 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;當做作業(yè)的時候要小心。選C。
點評：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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