The chair looks rather hard , but in fact , it is very comfo

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The chair looks rather hard , but in fact , it is very comfortable to_______ . A. sit
The chair looks rather hard , but in fact , it is very comfortable to_______ .
A. sit B. sit on C. be sat D. be sat on
为什么选B

it is +形容词+to do sth 是固定句式,做某事很怎么怎么样,所以it是形式主语,不是指代the chair,所以不能用被动,排除CD,这句话后半句的完整形式应该是it is very comfortable to sit on the chair 宾语the chair承前省略了,所以选B

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