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—Hi, Susan, you look tired.
—I       for months for the coming celebration of our school’s 90th anniversary.
A.was preparingB.have been preparingC.had preparedD.prepare
B

试题分析:考查时态:句意:--你好,Susan,你看起来很累。--我一直为即将到来的学校的90周年庆典做准备。说明这几个月一直在准备,而且一直到现在都很累,用现在完成进行时,选B。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。这题关键是弄清现在完成进行时的基本用法和抓住句子的关键you look tired 和时间for months。
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