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

A

解析：從題干前部分句子的謂語動詞結(jié)構(gòu)（虛擬語氣）可以看出是指過去某個時間已經(jīng)下了整天的雨。所以應(yīng)該用一般過去時態(tài)。該題解題關(guān)鍵要從題干前部分入手。if非真實條件句用的過去完成時，主句用would have done，我們可以看出這是與過去事實相反的虛擬語氣。

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