This question is hard to ( )A.be answered B.answer 为什么选B不选A

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This question is hard to ( )A.be answered B.answer 为什么选B不选A
This question is hard to ( )
A.be answered B.answer
为什么选B不选A

This question is hard to ( )A.be answered B.answer 为什么选B不选A
英语中有些形容词,如easy,difficult,hard,dangerous等,后面接动词不定式时,动词不定式往往与主语构成动宾关系,同时,它可以借助it来做形式主语.上面这个句子可以换成以下说法:
This question is hard to answer.
=To answer this question is hard.
=It is hard to answer this question.
由此可见,只能选B不选A.
就像这句This river is dangerous to swim in.

不知道你是否听过一句话'It is hard to say.'和你的问题是一样的句型结构。这个句子本来的样子是:To anwser this question is hard.为了避免主语过长,句子结构就变成了This question is hard to answer.

你好,很高兴为你解答\(^o^)/~
这里是主动表被动的特殊用法