put 语法填空during his useful life he often felt he was useless."Alfred Nobel ,"he once wrote to himself,"ought to (put)to death by a kind doctor as soon as ,with a cry ,he entered life."为什么不能用be put 涉及到什么知识?

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put 语法填空during his useful life he often felt he was useless.

put 语法填空during his useful life he often felt he was useless."Alfred Nobel ,"he once wrote to himself,"ought to (put)to death by a kind doctor as soon as ,with a cry ,he entered life."为什么不能用be put 涉及到什么知识?
put 语法填空
during his useful life he often felt he was useless."Alfred Nobel ,"he once wrote to himself,"ought to (put)
to death by a kind doctor as soon as ,with a cry ,he entered life."
为什么不能用be put 涉及到什么知识?

put 语法填空during his useful life he often felt he was useless."Alfred Nobel ,"he once wrote to himself,"ought to (put)to death by a kind doctor as soon as ,with a cry ,he entered life."为什么不能用be put 涉及到什么知识?
ought to+have+过去分词”既可表示本该做而事实上没有做的事,也可以表示惊讶、赞叹等情绪.
其实“情态动词+have+过去分词”是很重要的一种句型,除should外,may,might,must,couldn’t,needn’t,ought to等都可以用于这一句型.

这个。。。。其实我也想选be put的,从语法上来说应该没有错啊。难不成这里用被动的一般过去时没有用过去完成时通顺么?和楼主一起求达人。