We'll go to the Great Wall if it 　　　 rain tomorrow.　　　

[　　]

A． will　　　B．won't　　　C．isn't　　　D．doesn't

We won't go to the Great Wall if it ________ tomorrow.

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I don’t know if it________ tomorrow．If it________，we will go to the Great Wall．

1. A.
   will rain，won’t rain
2. B.
   will rain，doesn’t rain
3. C.
   rains，won’t rain
4. D.
   rains，doesn’t rain

从所给的四个选项中选择最佳答案

If it ______ tomorrow, we won't go to the Great Wall.

[　　    ]

A．rain　　  　　　　　　B．rains

C．will rain　　　　　　D．is going to rain