Our research has focused on a drug which is so powerful able to change brain chemistry.A. as to be B. as not to beC. as being D. as not being 题目和参考答案——青夏教育精英家教网—

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Our research has focused on a drug which is so powerful 　　　　able to change brain chemistry.

A. as to be B. as not to be

C. as being D. as not being

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