If the weather had been better, we could have had a picnic. But it all day.
A. rains
B. has rained
C. rained
D. is raining
网友回答
A. rains
B. has rained
(答案→)C. rained
D. is raining
解析：考查虚拟语气和时态。在虚拟语气中，but后面的句子应该使用陈述语序。本题根据. If the weather had been better, we could have had a picnic说明是与过去事实相反的虚拟语气，那么but后面的陈述句使用一般过去时。
考点;考查虚拟语气和试题