问题描述：
be going to与will be的区别?
Look at these clouds.______.
A. It'll rain B. It's going to rain C. It'll be rain D. It is to rain
答案是B 请问为什么不能选C?
Look at these clouds.______.
A. It'll rain B. It's going to rain C. It'll be rain D. It is to rain
答案是B 请问为什么不能选C?
问题解答：
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