I will go shopping tomorrow afternoon if I______my work ahea

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I will go shopping tomorrow afternoon if I______my work ahead of time.
A.finished B.have finished C.am finishing D.will finish
我想问下为什么不选A,IF引导的从句虚拟语气表将来不是应该用过去时吗、
You can borrow books from the library ______you have a student ID from this university.
A.in that B.as if C.only if D.if only
我知道C和D的用法区别,但是D也可以引导真实条件句表示“只要”那么这里为什么不能选.

1.第一题中的B,是现在完成时,表示那个动作所发生的与接下来的事情有一定的联系,强调一个顺序性,先后性.提前完成了工作就可以去购物了,这两个动作是有顺序并且有关联的,用A只是表明过去发生了,没有顺序性,没有什么联系.而且这句话的主句是将来时,条件从句里面的将来时就要用现在的时态来代替将来,从这个角度讲,也不应该是A.
2.这句话只是在说一个条件,只要你有学生证,就可以借走我的书.没有虚拟语气.C才是引导真实条件的,而D是引导虚拟语气的.

I will go shopping tomorrow afternoon if I______my work ahea We will go shopping if it____ tomorrow. If it _____(not rain)tomorrow ,I will go shopping with my fr 1.we will go shopping if it___ tomorrow I'll go shopping with you ,if I( )free tomorrow （）,i will go there with you tomorrow afternoon. If you go shopping tomorrow,______. will eve go shopping tomorrow?怎么回答 Wy mother will go shopping if it__(not rain)tomorrow,so Irea We won't go swimming if it ( )tomorrow afternoon.A.will rain if it ( ) tomorrow,I will go there by car 1.I suggest_______(go) shopping this afternoon.