题目内容
4.One theory explaining this phenomenon suggests that acupuncture ______ pain signals from reaching the brain.( )A. | have blocked | B. | block | C. | blocked | D. | blocks |
分析 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.
解答 答案:D
考查动词时态.此处在句中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.选择D项.
点评 本题考查时态.做时态题时,首先要看句子的时间状语,如果没有时间状语,就从句子暗含的意思来确定句子的时态.

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