问英文语法题Tom ___better than to ask Dick for help.A should have known B shouldn't know C has known D shall konw 谁可以帮我解释一下这一题,怎样分析,

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问英文语法题Tom___betterthantoaskDickforhelp.AshouldhaveknownBshouldn''tknowChasknownDshallkonw谁可以帮我解释一下这一题

问英文语法题Tom ___better than to ask Dick for help.A should have known B shouldn't know C has known D shall konw 谁可以帮我解释一下这一题,怎样分析,
问英文语法题
Tom ___better than to ask Dick for help.
A should have known B shouldn't know C has known D shall konw
谁可以帮我解释一下这一题,怎样分析,

问英文语法题Tom ___better than to ask Dick for help.A should have known B shouldn't know C has known D shall konw 谁可以帮我解释一下这一题,怎样分析,
should have done的用法:本应该做的事实际上没有做成,含有埋怨或者责备的语气,此句子意思为本该知道向汤姆寻求帮助的,实际上却向迪克寻求帮助了,暗含责备自己的意思,也许迪克更能帮助自己解决问题吧,符合题意,其他三项没有这种用法.

表示责备, 应该知道更好地做。。。。
should have done 是虚拟,对过去发生事情的一种责备语气。