【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:除非科學(xué)家們放棄,否則他們將會(huì)實(shí)驗(yàn)成功。 unless 連詞,除非,引導(dǎo)條件狀語(yǔ)從句。所以選A。

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