I find these problems are easy ____a.to be worked out b.to work them outc.to work out d.to be worked them out选C 表是被动为什么不选A呢?

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Ifindtheseproblemsareeasy____a.tobeworkedoutb.toworkthemoutc.toworkoutd.tobeworkedthemout选C表是被动为什么不选

I find these problems are easy ____a.to be worked out b.to work them outc.to work out d.to be worked them out选C 表是被动为什么不选A呢?
I find these problems are easy ____
a.to be worked out b.to work them out
c.to work out d.to be worked them out
选C 表是被动为什么不选A呢?

I find these problems are easy ____a.to be worked out b.to work them outc.to work out d.to be worked them out选C 表是被动为什么不选A呢?
具体原因我也说不清,但有很多这样的例子:
the book is easy to read
the movie is good to watch
the job is fun to do
your voice is nice to hear

生出来就是这样的结构!

A 很怪啊。。
哪有那么讲的--
语法你问我我也说不出来,sorry.