If the weather had been better we could have had a picnic. But it all day.A. rainsB. rai

问题补充：

If the weather had been better, we could have had a picnic. But it all day.

A. rains

B. rained

C. has rained

D. is raining

答案：

A. rains

(答案→)B. rained

C. has rained

D. is raining

解析：考查时态：句意：如果天气好一些，我们就会去野餐了。但是整天都在下雨。从前面的if条件句和主句可以看出是对过去情况的虚拟，而but后面的内容是过去的事实，用一般过去式。选B。