I find these problems are easy ___.A.to work out B.to be worked outC.in working out D.to be worked theme out

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I find these problems are easy ___.A.to work out B.to be worked outC.in working out D.to be worked theme out

I find these problems are easy ___.A.to work out B.to be worked outC.in working out D.to be worked theme out
I find these problems are easy ___.
A.to work out B.to be worked out
C.in working out D.to be worked theme out

I find these problems are easy ___.A.to work out B.to be worked outC.in working out D.to be worked theme out
I find these problems are easy (for me)to work out.
此句省略了 for me,隐藏了work out 的逻辑主语.选A.

选A
主语是I,所以B D被动语态都排除
C 讲不出很大的错,但稍微有点英语语感的人都知道这个别扭。

A

A.to work out