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15.-Jack,let's go swimming.
-Sorry,I'm busy right now.I _____ for the exam tomorrow.(  )
A.prepareB.have preparedC.am preparingD.will prepare

分析 --Jack,我们一起去游泳吧.
--抱歉,我现在很忙.我在准备明天的考试.

解答 答案:C.
考查动词的时态.根据前面的时间状语right now可知,描述的说话当时的动作,表示正在准备明天的考试;故选用现在进行时;所以选C.A为一般现在时,表示习惯性或经常性的动作,B项为现在完成时,表示过去的动作对现在造成的影响和结果;D项为一般将来时,表示将来要发生的动作.

点评 对于动词时态的考查要搞明白每个时态的具体用法,尤其是要熟悉一些时态中的典型时间状语.

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