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题型：单选题 题类：常考题 难易度：普通
In winter, children in the north often {#blank#}1{#/blank#} {#blank#}2{#/blank#} in the snow.
The boy went to the library {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} this morning.
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