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题型：语法填空（单句） 题类：常考题 难易度：普通
广东省深圳市中考英语语法专练（十）•动词的时态
—Yes. I ______ it since I entered the college. This is a best-seller.
—One hour ago, but I _______ it yet.
{#blank#}1{#/blank#}have the Greens been to the Great Wall?
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