题目内容
8．一Tom，could you help me water the flowers？一Sorry，I ________my homework．（ ）
| A． | was doing | B． | did | C． | am doing | D． | will do |
分析 ---汤姆，你能帮我浇花吗？
---抱歉，我正在做作业．
解答 答案：C．结合句意可知表达的是现在正在进行的动作用现在进行时be+doing，主语I，故am，故答案是C．
点评 可用来表示现在进行时的时间状语，常用的有：now，this week，at the moment，right now 等；或者告诉你一个准确的现在时间，或者用look，listen（常用于句子的开头，表示提醒听者注意正在发生的事情）．
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