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 题目和参考答案——青夏教育精英家教网—

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

解析:

从题干前部分句子的谓语动词结构（虚拟语气）可以看出是指过去某个时间已经下了整天的雨。所以应该用一般过去时态。该题解题关键要从题干前部分入手。if非真实条件句用的过去完成时，主句用would have done，我们可以看出这是与过去事实相反的虚拟语气。

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