Scientists think they have in their attempt to find the causes of some major die
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Scientists think they have _____ in their attempt to find the causes of some major dieases.
A. broken through B. worked out C. fallen out D. got round
试题答案
A
break through 突破;取得重大成果。本题译文：科学家认为他们在探索某些重要疾病的病因中已取得重大突破。