He thought( )a little difficult to work out this maths problemthere /it/this/that选词填空

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He thought( )a little difficult to work out this maths problemthere /it/this/that选词填空
He thought( )a little difficult to work out this maths problem
there /it/this/that
选词填空

He thought( )a little difficult to work out this maths problemthere /it/this/that选词填空
it
it 在这里做形式宾语

it

that, 只能填that,因为that不能当任何成分。
如果选其他任何一个,多时充当主语的,都必须在后面跟一个be动词!
如果没有be动词,主语也不能要,这叫主谓同省!
主谓要么同时省略,要么都不能省略,下面是都不省略的例子!
he thought that it is a little difficult to work out this maths probl...

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that, 只能填that,因为that不能当任何成分。
如果选其他任何一个,多时充当主语的,都必须在后面跟一个be动词!
如果没有be动词,主语也不能要,这叫主谓同省!
主谓要么同时省略,要么都不能省略,下面是都不省略的例子!
he thought that it is a little difficult to work out this maths problem.

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it
he find/think/suppose it adj.to do sth.