【題目】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】

考查形容詞辨析。句意：這位科學家為了讓科研有突破，付出了巨大的努力。A. modest謙虛的；B. miserable悲慘的；C. optional可選擇的；D. tremendous巨大的，故選D。

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