Tony ______ yesterday if he were really serious about his work.

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问题 Tony ______ yesterday if he were really serious about his work.

选项 A、ought to come
B、should come
C、must have come
D、should have come

答案D

解析 此处涉及虚拟语气的用法,如果主句和从句的谓语动词指不同的时间,这时需要用混合虚拟语气。一般来说,在这种情况下,主从句谓语动词指代的时间不同,所以我们又可以错综时间条件句,在这种虚拟情况,动词形式应根据实际情况灵活使用,在做这些题目时候尤其要注意每道题目的提示语:时间状语。绝大多数情况下,从句或者主句都有相关的时间状语,这是解题的关键。如:①Many dead would now be alive if they have not attempted to return for something.②Had Paul received six more votes in the last election, he would be our chairman now.混合虚拟语气还有一种情况就是事实和虚拟假设的混合句,这样的句子不仅仅是时间的不同,而重要是事实和假设的混合。I would have gone to visit him in the hospital had it been at all possible,but I was fully occupied the whole of last week,该句前半部分是假设虚拟,而后半部分是事实的陈述。Your math instructor would have been happy to give you a make-up examination had you gone and explained that your parents were ill at the time.该句前半句用的是假设虚拟,后半句主句也用的是假设虚拟(如果你去并且解释的话),但是后半句的从句用的是事实语气,因为“父母病了”是客观事实,故不需要用虚拟形式had been。题中主句时间为过去时,因此答案为[D]。
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