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题型：单选题 题类：真题 难易度：容易
—Sorry, sir. I wasn't there at that time yesterday.
He asked us {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} best.
—I must ask my mom. She may let me do homework at home.
David explained {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} in his diary.
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