【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】句意:除非科學(xué)家們放棄,否則他們將會(huì)實(shí)驗(yàn)成功。 A unless 連詞,除非,引導(dǎo)條件狀語(yǔ)從句;B if,如果;C after,之后;D until,直到……故選A。

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