When _______ homework , you should be ca...

When _______ homework , you should be careful .

A．do

B． to do

C．doing

D． done

C 【解析】试题分析：考查省略句：英语中主从句的主语一致时，可以省略从句的主语和be动词，when doing =" when" you are doing，句意是;当做作业的时候要小心。选C。考点：考查从句的省略式

考点分析：

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