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题型：语法填空（单句） 题类： 难易度：普通
人教版（2019） 选择性必修第三册 Unit 4 Adversity and Courage限时训练
— I regret ______ you that he can't come today.
We will try to {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} {#blank#}5{#/blank#}.
It happened {#blank#}1{#/blank#} when I got off the train.
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