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题型：单选题 题类：模拟题 难易度：普通
北京市昌平区2017届九年级下学期英语第二次（5月）模拟考试试卷
— Oh, I ___________ to the party.
The old man's serious eye problem{#blank#}1{#/blank#} {#blank#}2{#/blank#}by Dr. Ma two months ago.
—Thank you! It {#blank#}1{#/blank#} (clean) an hour ago.
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