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【题目】To make a breakthrough in his scientific research, the scientist has been making a(n) _____amount of effort.

A. modest B. miserable

C. optional D. tremendous

【答案】D

【解析】

考查形容词辨析。句意:这位科学家为了让科研有突破,付出了巨大的努力。A. modest谦虚的;B. miserable悲惨的;C. optional可选择的;D. tremendous巨大的,选D。

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