【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(xué)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,選D。

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