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题型：单选题 题类：常考题 难易度：普通
过去完成时——原本….未能…..
We {#blank#}1{#/blank#}having a picnic when it {#blank#}2{#/blank#} started to rain.
He told me that he {#blank#}1{#/blank#} {#blank#}2{#/blank#} his book in his room.
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