They weighed the advantages of the operation all the possible risks involved over and ove

发布时间：2020-08-17 02:35:27

They weighed the advantages of the operation      all the possible risks involved over and over again.
A. within 　　　　
B. except　　　　　
C. behind　　　　　
D. against

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A. within 　　　　
B. except　　　　　
C. behind　　　　　
(答案→)D. against
解析：考查固定短语。Weigh sth against sth衡量…与…；句意：他们一再仔细衡量了手术的优势和包含的危险。故D正确。
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