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One theory this phenomenon acupuncture r...

One theory         this phenomenon         acupuncture reduces pain suggests that acupuncture_____ pain signals from reaching the brain.

A. explaining; that; should block    B. which explains; where; can block

C. that explains; where; block    D. explaining; that; blocks

 

D 【解析】 考查现在分词、同位语从句和动词时态。句意:一种解释这种现象的理论认为,针刺疗法使疼痛信号无法达到大脑。第一空处,theory是先行词,后面是that/which引导的定语从句或现在分词作定语;第二空处,名词phenomenon后面是其具体内容,是that引导的同位语从句;在句中suggest意为"认为,表明",没有"建议"之意,后接宾语从句不需要使用虚拟语气,acupuncture应视作第三人称单数,排除了选项A、B;描述的现象属于一般性事实,要用一般现在时,排除选项C。故D项符合题意。  
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