这里的主语是动词不定式短语"to master some knowledge of first aid",谓语动词为系词"is",表语用了名词.主语与表语（抽象名词）之间不能等同,所以要用形容词来做表语.这里的"of"就起到了这样的作用.选"of".
to master some knowledge of first aid is(of/for/with/to)grea
4个回答
相关问题
-
The book_________first aid is of great help to me.
-
It shows that a knowledge of first aid can ______________. A
-
It's the knowledge of first aid make a difference that when
-
It was John’s quick action and knowledge of first aid that s
-
In case of emergency, whether knowing how to apply first aid
-
It is necessary for to do first aid when we _____ someone in
-
Because of AIDS,some doctors are reluctant to give people CP
-
come to the aid of
-
___ good knowledge of psychology is essential to ____ study
-
we decide to go for a field trip with some friends of