wangqixiaqi
选：b.willrain,doesn'train因为：idon'tknowifit------tomorrow.“我不知道明天是否会下雨”，if引导宾语从句，表示：“是否”，“是否会下雨”要用“ifitwillrain”。ifit-----,we'llgotothegreatwall.意思是：“如果明天不下雨，我们将去长城”，if引导条件状语从句，表示：“如果”，在表示将来的条件状语从句中，谓语动词用一般现在时态，所以用“doesn'train”。因此综合2个空格考虑，应该选择b.祝您进步。
明月丶夜灬
用法：
1、(表示条件)如果 ,主句用将来时,if从句用现在时表示将来
He will come if you invite him.
如果你请他,他会来的.
2、(表示虚拟)假如,要是
时态：可以表示过去,现在和将来的`情况.它的基本特点是时态退后.
a.同现在事实相反的假设.
句型 ：条件从句 主句
一般过去时 should( would) +动词原形
If they were here,they would help you.
b.表示于过去事实相反的假设.
句型：条件从句 主句
过去完成时 should(would) have+ 过去分词
If she had worked harder,she would have succeeded.
The rice would not have been burnt if you had been more careful.
If my lawyer had been here last Saturday,he would have prevented me from going.
If he had come yesterday,I should / would have told him about it.
含义：He did not come yesterday,so I did not tell him about it.
If he had not been ill and missed many classes,he would have made greater progress.
含义：He was ill and missed many lessons,so he did not make greater progress.
c.表示对将来的假想
句型：条件从句 主句
一般过去时 should+ 动词原形
were+ 不定式 would + 动词原形
should+ 动词原形
If you succeeded,everything would be all right.
If you should succeed,everything would be all right.
If you were to succeed,everything would be all right.
3、是否 = whether 连接宾语从句
I wonder if she is ill.
不知她是否病了.
