I had a donkey and i never rode it,I took it to the market on a whim one day,这个题考察你对时态的掌握程度,这很明显是一个一般过去时态,所以你把have改成had就ok啦。也许你会问:把它改成一般现在时也行啊,但改错一般来说只改一次,所以只能改have啦。
i hope i can help you
I have a small donkey never on a whim, one day I take it to the market.或I have never been riding a small donkey, one day I take it to go to the market whim.