I'll go to the library with you if it () rain tomorrow morning. A.won't B.isn't C.hasn't D.doesn't

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I'll go to the library with you if it () rain tomorrow morning. A.won't B.isn't C.hasn't D.doesn't

D
主将从现的原则条件状语从句
连接词主要有 if,unless,as/so long as,on condition that 等..
if 引导的条件句有真实条件句和非真实条件句两种.非真实条件句已在虚拟语气中阐述.
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied,let's go out for a walk.
典型例题
You will be late ___ you leave immediately.
A.unless B.until C.if D.or
答案A.句意:除非你立即走,否则你就回迟到的.可转化为 If you dong leave immediately,you will be late.B、D句意不对,or表转折,句子如为 You leave immediately or you will be late.
比较while,when,as

B

d.主句用将来时,从句用一般现在是 isn't后用ing

D,主句一般将来时,从句用一般现在时

选D
如果明天早上不下雨的话我就和你一起去图书馆。