I think -----necessary to find out some information about it before the students travel to Hong KongA.that'sB.it'sC.itD.this is为什么不是it

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I think -----necessary to find out some information about it before the students travel to Hong KongA.that'sB.it'sC.itD.this is为什么不是it
I think -----necessary to find out some information about it before the students travel to Hong Kong
A.that's
B.it's
C.it
D.this is
为什么不是it

I think -----necessary to find out some information about it before the students travel to Hong KongA.that'sB.it'sC.itD.this is为什么不是it
B和C都是对的,B是复合句,是Think的从句；C是简单句,it做宾语补足语感觉B更好点

it，它做形式宾语

B.it's

A 答案可以参考下

选B，因为necessary是adj，
如果necessary换成动词或别的什么才选用it
比如，某个场景说到up to my ears很多人不知道这句话的意思，
有人说I think it means I‘m stuffed. 我想那应该是吃饱了的意思。
PS：中文有个说法叫吃的耳朵都动了，表示东西非常好吃，
up to my ears的意思就是东西都填...

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