题目

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：A 解析: A  If the weather had been better, we could have had a picnic.此句是对过去事情的假设，但事实上下了一天雨，根据句意，最后一句应用一般过去时，表示对过去事实的陈述。

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