If the weather had been better,we could have had a picnic.Bu

If the weather had been better,we could have had a picnic.But it___all dayA.rained B.rains C.has rained D.is raining我的问题是想要表达过去一直...且与all day这样的时间联用了,应该用was raining更好吧?表示：但是下了一整天的雨,过去一段时间某动作一直进行.选A 只能是时态上没有对应的了,没办法才选的.