She ________ on her work so much that she didn’t notice that a crowd of people had _______around her.A.focused; focusedB.fixed; gatheredC.concentrated; concentratedD.carried; collected
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B解析第一空表示：专注于,focus on和concentrate on都可以，第二空填gather“聚集”句意是：她专注于学习以至于没注意到一群人围在她身边。选B。