题目内容
8．-What's Tony doing now？-He his mother at home．（ ）
| A． | is help； do some cleaning | B． | helping； does some cleaning | ||
| C． | is helping； does some cleaning | D． | is helping； do some cleaning |
分析 ---托尼现在在做什么？
---他在家帮妈妈打扫卫生．
解答 答案：D
由now可知时态要用现在进行时，谓语结构为am/is/are+动词的现在分词．此题主语he是第三人称单数，所以be动词要用is，加上help的现在分词；help sb do sth表示帮助某人做某事，所以此题中的do要用原形，综合分析可知答案为D．
点评 考查对时态知识点的掌握，当句子中有时间状语时，根据时间状语确定正确的时态，并注意时态的构成，此题还考查动词help的用法，掌握其用法也是此题解题关键．
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