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

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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
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.
If the weather had been better,we could have had a picnic.Bu
首先前面的整个句子是过去的事情.所以描述过去用过去时
其次was raining是强调动作,rained是强调状态,这里强调全天下雨这个状态.