這里是虛擬語(yǔ)氣
原句可以轉(zhuǎn)化為
If _____ possible,I would have paid a visit to you.
這里是與過(guò)去事實(shí)相反,由主句中would have paid可看出
所以空里應(yīng)該是 it had been.即原題中的B
如果樓主還是有點(diǎn)不懂可以補(bǔ)一點(diǎn)虛擬語(yǔ)氣的知識(shí)A不是虛擬語(yǔ)氣嗎呵呵。?？磥?lái)樓主虛擬語(yǔ)氣不夠扎實(shí)啊學(xué)的if it were是與現(xiàn)在事實(shí)相反如果要用if it were,后面的主句必須是would pay但是原句是would have paid這是固定的搭配If ……did，……would do……與現(xiàn)在事實(shí)相反If……h(huán)ad done,……would have done與過(guò)去事實(shí)相反