you work hard enoughyou be able to get a PhD degree in three years.

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问题 ______you work hard enough______you be able to get a PhD degree in three years.

选项 A、Only if, will
B、If only, would
C、Should, will
D、Unless, would

答案C

解析本题考查only if的用法。Only if“只有，唯有”，当only if条件从句在前，中间无逗号时主句要倒装。

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