题目内容
3．Dave is a good boy and he always finishes _______ his homework on time．（ ）| A． | do | B． | did | C． | does | D． | doing |
分析 戴夫是个好孩子，他总是按时完成家庭作业．
解答 答案：D．考查动名词．句意：戴夫是个好孩子，他总是按时完成家庭作业．do这里是动词做的意思，过去式是did，单数第三人称形式是does．动名词是doing．finish doing sth完成某事，是固定搭配．根据题干可知句意为戴夫是个好孩子，他总是按时完成家庭作业．这里用finishes doing his homework on time按时完成他的家庭作业．故选D．
点评 理解各个选项的含义，及其用法的区别，根据具体内容作答．
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