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题型:单选题 题类:真题 难易度:普通
B: Yes, it more than l00 years ago.
—Can you tell me what they are?
—None, dear. They ________ for your father.
The picture of a black hole{#blank#}1{#/blank#} {#blank#}2{#/blank#}to the world by the scientists on April 10.
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