"Not until science became prominent ___ be abolished", some people argue. "A. that slavery came to B. slavery to C. had slavery come to D. did slavery come to "

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题目内容（西安交通大学--英语三）

"Not until science became prominent ___ be abolished", some people argue. "A. that slavery came to B. slavery to
C. had slavery come to D. did slavery come to
"

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