________, we will leave without her.

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问题 ________, we will leave without her.

选项 A、If she were to fail to come on time
B、She should fail to come on time
C、Should she fail to come on time
D、Fail to come on time she should

答案C

解析 本题考查虚拟语气。由后半句时态为一般将来时可以推知,前半句应表示与将来情况相反,if引导的从句结构应为“if+主语+should do/were to do/动词过去式”。B项和D项不符合虚拟语气结构,故排除。C项是省略if后将should提前的虚拟语气倒装,与A项都表示对将来情况的虚拟,但相较于should do,were to do表示可能性极小,微乎其微——if从句如果用were to do过去式表将来,则主句谓语必须用虚拟语气,即情态动词的过去形式,故排除A项,C项更符合语义,故为答案。
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