【題目】The scientists will succeed in their experiment they give up.

A. unless B. if C. after D. until

【答案】A

【解析】

試題分析:句意:科學(xué)家們會在實驗上成功,如果他們不放棄A. unless除非,如果不;B. if如果; C. after在……之后;D. unti直到。結(jié)合語境,故選A。

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