题目内容
16．-Excuse me，Linda．Can you go to the zoo with me？-Sorry．I ________ my homework．（ ）
| A． | do | B． | did | C． | was doing | D． | am doing |
分析 --打扰一下，Linda．你能和我一起去动物园吗？
--对不起．我正在做作业．
解答 答案：D
根据Can you go to the zoo with me？可知这是在邀请Linda去动物园，根据Linda的回答sorry来看，Linda是拒绝了，表示Linda现在正在忙着做某事，故应用现在进行时（be+doing）．do为一般现在时；did为一般过去时；was doing为过去进行时；am doing为现在进行时．故选D．
点评 本题考查时态辨析．要通过句子的含义与语境判断出动作发生的时间，是做题的关键．
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