Question

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

Answer 1

A

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