His idea was such a good one we all agreed to use it.A. asB. thatC. soD. but

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A. as
(答案→)B. that
C. so
D. but
解析：考查固定句式。固定句式:such…that…如此…以至于…；that引导的是一个结果状语从句。本题容易错选A项，as引导的是一个定语从句，如果选A项，后面多了一个it，成分重复。故B正确。