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题型：单选题 题类：常考题 难易度：普通
At that time, none of them knew {#blank#}1{#/blank#} the outside world.
I {#blank#}1{#/blank#} {#blank#}2{#/blank#} to that party last night.
{#blank#}1{#/blank#}cooking will be a basic skill for pupils from next term.
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