the problem is difficult ___ .a.to solveb.to be solved c.being solvedd.to solving 写出原因!

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theproblemisdifficult___.a.tosolveb.tobesolvedc.beingsolvedd.tosolving写出原因!theproblemisdifficult___.

the problem is difficult ___ .a.to solveb.to be solved c.being solvedd.to solving 写出原因!
the problem is difficult ___ .
a.to solve
b.to be solved
c.being solved
d.to solving
写出原因!

the problem is difficult ___ .a.to solveb.to be solved c.being solvedd.to solving 写出原因!
A
主语(人,物) + be + 形容词+ to do (不定式主动式)
此句型中的主语是后面不定式的逻辑宾语,所以不定式不用被动式
再如:
The question is easy to answer.这问题很容易回答
He is hard to deal with 他难相处
The apple is good to eat.这苹果好吃
不懂追问
*^__^*

b 被动

B 被动语态 这个问题很难被解决.

A difficult 后面常跟上动词不定式,而且用主动代替被动