【題目】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

【答案】A

【解析】考查固定句式。句意：我們的研究集中在一種藥品上。這種藥品如此有效，可以改變大腦的化學組成。so…as to do sth.是固定句式，意為“如此……以致于……”。故A選項正確。

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