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题型：单选题 题类：常考题 难易度：普通
北师大版（一起点）小学英语一年级下册Unit 11同步练习（1）
One hour {#blank#}1{#/blank#} {#blank#}2{#/blank#}.
He {#blank#}1{#/blank#} to swim and did it very well.
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