Like several other important advances in medicine, penicillin was a somewhat (i)

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问题 Like several other important advances in medicine, penicillin was a somewhat (i) ______ discovery resulting from (ii)______combination of blind chance and technical expertise.

选项

答案 C,D

解析 resulting from说明前后同义重复。两空联动,同义重复。progressive进步的,untimely时间不恰当的,accidental意外的;favorable有利的,unlucky不幸的,reliable可靠的。答案选CD。
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