Some of us ( )is very imortant.A(know) B(knows) C(knowing)D(to know)是C还是D,还麻烦告诉小弟当两个动词一起出现时,什么时候用Ving形式,什么时候用TO+ V原.

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Some of us ( )is very imortant.A(know) B(knows) C(knowing)D(to know)是C还是D,还麻烦告诉小弟当两个动词一起出现时,什么时候用Ving形式,什么时候用TO+ V原.
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Some of us ( )is very imortant.A(know) B(knows) C(knowing)D(to know)是C还是D,还麻烦告诉小弟当两个动词一起出现时,什么时候用Ving形式,什么时候用TO+ V原.
Some of us ( )is very imortant.A(know) B(knows) C(knowing)D(to know)
是C还是D,还麻烦告诉小弟当两个动词一起出现时,什么时候用Ving形式,什么时候用TO+ V原.

Some of us ( )is very imortant.A(know) B(knows) C(knowing)D(to know)是C还是D,还麻烦告诉小弟当两个动词一起出现时,什么时候用Ving形式,什么时候用TO+ V原.
knowing
该句子可以改为() is very important
just like swimming is my faviourt sport

应该是,some of us know it is。。。。。

to know
如果动词后需要名词是用ing 例如know +n.\v-ing
一般动词后加动词中间用to 例如how to ask him?