English is ____ a bridge to so____knowledgeI found _____too hard to learn English grammer.A.that B.it c.this D.that's要理由

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English is ____ a bridge to so____knowledgeI found _____too hard to learn English grammer.A.that B.it c.this D.that's要理由
English is ____ a bridge to so____knowledge
I found _____too hard to learn English grammer.
A.that B.it c.this D.that's
要理由

English is ____ a bridge to so____knowledgeI found _____too hard to learn English grammer.A.that B.it c.this D.that's要理由
D.that's
too hard to 太难而不能.用that,this要加句子吧.
用B的话,肯定要加动词,也就是用it is.

it

选B

d