When _______ homework , you should be careful .A．doB． to doC．doingD． done
题型：不详难度：来源：
When _______ homework , you should be careful .| A．do | B． to do | C．doing | D． done |
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答案
| 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。
点评：做这种题目可以用还原法做题，先把主语和be动词加上，再判断是主动还是被动。句意通顺才行。 |
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