If the weather had been better we could have had a picnicBut it all day．A. rainedB. rains

问题补充：

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

A. rained

B. rains

C. has rained

D. is raining

答案：

(答案→)A. rained

B. rains

C. has rained

D. is raining

解析：考查时态。根据前半句的时态可知是与过去事实相反的虚拟语气。But后面的句子使用陈述语气，故使用过去时。