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问题: 求助一道单选

______the general state of his health, it may take him a while to recover from the operation.
A. Given B. To give C. Giving D. Having given
it作形式主语不应该选B吗?

解答:

given :介词,考虑到,例如:
Given his ability ,I am sure he is fit for the job
Given that he is young ,he has done it well
这句话的意思:考虑到他的基本健康状况,它需要很长的时间才能从手术中恢复过来
to give:动词不定式表示目的,为了...
一般来说,动词不定式表目的时,后边的主句主语都是人,例如:
To succeed in doing it ,we need some help
而原题目中是it做主语,所以不能动词不定式