When _______ homework , you should be careful .
- A.
do
- B.
to do
- C.
doing
- D.
done
C
試題分析：考查省略句：英語(yǔ)中主從句的主語(yǔ)一致時(shí)，可以省略從句的主語(yǔ)和be動(dòng)詞，when doing =" when" you are doing，句意是;當(dāng)做作業(yè)的時(shí)候要小心。選C。
考點(diǎn)：考查從句的省略式
點(diǎn)評(píng)：做這種題目可以用還原法做題，先把主語(yǔ)和be動(dòng)詞加上，再判斷是主動(dòng)還是被動(dòng)。句意通順才行。
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