虚拟语气15.Mary ____ today if the doctor had come sooner last ni

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虚拟语气
15.Mary ____ today if the doctor had come sooner last night.
A.has been alive B.would be alive C.had been alive D.were alive
从句 had come,主句不是应该用 would have done.为什么不选A?
2.He was very busy yesterday; otherwise he ( come) _would have come_____ to the meeting.
Otherwise 引导的是一个条件从句,不是应该用 had come的嚒?
20.The piano teacher would rather that her student (practice)__practiced_____ at least one hour every day in preparation for the coming performance.
这里怎么判断是对现在的虚拟,不是对过去的虚拟,用 had practiced

1.选B “如果昨晚医生来得早点的话,Mary 将会活着.
虚拟语气中必须用和过去有关的时态,A一定是错的；if引导的从句用了过去（完成）时,主句一定用过去将来时,一定是选B ,至于是不是would have done 就不重要了.
2.otherwise“否则”,确实是引导条件从句,但它的主句一般用将来时态.你想想这句是不是应该这样翻译：“他昨天很忙,否则他将已经来这个会上了”.
3.would rather “宁愿”,后常接虚拟语气,用一般过去时.
这里的would rather 是一般现在时,后面的从句只有表示过去的动作时,才用过去完成时.
你看这里的从句“学生每天至少练习一小时”是过去的动作吗?它只是表示现在,用虚拟语气把它退到一般过去时就可以了.

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