题目内容
18．-What _______ you ________？-I'm doing my homework．（ ）| A． | do； do | B． | are； do | C． | are； doing | D． | did； do |
分析 你正在干什么？我正在做作业．
解答 答案：C．根据题干，本句的意思是你正在干什么？我正在做作业．根据答语I'm doing my homework可知，本句应用现在进行时．现在进行时的结构时候am/is/are doing．故选C．
点评 本题考查现在进行时，做题时应注意题干中暗示的动作发生的时间．
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