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Why didn't you remind him of the possible danger?

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Why didn't you remind him of the possible danger?
But what ____ otherwise?He never listens to me.
A.could I do B.could I have done C.should I do D.must I have done
Why didn't you remind him of the possible danger?
otherwise,此句使用虚拟语气.
对现在的虚拟:would + do;
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 to listen to me.
不然我还能做什么呢?他从来都不听我的.