This problem is really hard_______ .A.to work out B.to be wo

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This problem is really hard_______ .A.to work out B.to be worked out C.working out D.worked ou
此题为什么选A不选B呢?或此题正确做法是?

英文中,有时使用主动语态来表达这种被动语态.这个句子中Problem应该是动作的接受者,但是用主动语态来表达”被解出“.类似的句子还有：
1. The house needs cleaning.
房子需要（”被“）清扫.
2. The pen writes well.
这个钢笔（”被“）写的流畅.
你可以看一下英文中主动表被动的归纳总结：
http://wenku.baidu.com/view/1cb44a7d27284b73f2425098.html

This problem is really hard_______ .A.to work out B.to be wo he is the second () out the problem.A.working B.to work C.wo It is really clever _____him to work out the problem.A.for.B It is ______ to work out this problem. the maths problem is too difficult for me to work out还是to wo this is a problem easy enough to work out in two minutes是什么意 This maths problem is a bit difficult fot me to work out. I think .difficult to work out the problem.A,it B.this C.tha This maths problem is easy to work out.同义句This maths problem it is easy for you____.a.to work out the problem b.working o The problem is ____ easy for me ___ work out.A.too,to B.engo 英语选择题：This is the best way__out the problem. A.work B.to wor