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题型：单选题 题类：常考题 难易度：普通
He is doing nothing {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} .
{#blank#}1{#/blank#}, he has been a fan of American country music.
introduce; single; develop; trade; connect; print
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