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题型：单选题 题类：常考题 难易度：普通
— It's a circle.
—Many times a day.
{#blank#}1{#/blank#} {#blank#}2{#/blank#} they {#blank#}3{#/blank#} much food {#blank#}4{#/blank#}?
{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} has he been to Beijing?
—Sometimes.
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