---Why did you leave without a word of warning to John?
问题描述：
---Why did you leave without a word of warning to John?
---But what__________otherwise?He never likes to listen to me.
A.could I have done B.must I have done C.could I do D.should I do
答
选Aotherwise,此句使用虚拟语气.对过去的虚拟：would + have done.--Why did you leave without a word of warning to John? 为什么你不教训一下约翰就走了?--But what could I have done otherwise? He never likes...