______ (introduce) a person to others is very difficult for a shy man like T______ (introduce)a person to others is very difficult for a shy man like Tom.这种题什么时候用doing什么时候用to do.

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______(introduce)apersontoothersisverydifficultforashymanlikeT______(introduce)apersontoothersisvery

______ (introduce) a person to others is very difficult for a shy man like T______ (introduce)a person to others is very difficult for a shy man like Tom.这种题什么时候用doing什么时候用to do.
______ (introduce) a person to others is very difficult for a shy man like T
______ (introduce)a person to others is very difficult for a shy man like Tom.
这种题什么时候用doing什么时候用to do.

______ (introduce) a person to others is very difficult for a shy man like T______ (introduce)a person to others is very difficult for a shy man like Tom.这种题什么时候用doing什么时候用to do.
答案:introducing
因为很明显,这里缺少一个主语,但是,动词本身一般是不能直接做主语的,需要将动词名词化,那就是用动名词.所以,这里要用introducing
明白了吗?

在你的句子里面,doing 和 to do 都是正确的表达,都是做句子的主语部分。