i found this problem are easy ________

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i found this problem are easy ________
A.to be worked out
B.to work them out
C.to work out
D.to be worked them out
c翻译并分析其他的为什么不选?

C 因为前面找得到主语 “I” 不用被动.problem就是work out 的宾语,加them就重复了
再问：因为前面找得到主语 “I” 不用被动怎么理解？
再答： work out 的这个动作是由“I”做的。 "找得到主语不用被动"是一条语法规则。一般高中老师都知道。

i found this problem are easy ________ I found it easy (to work) out the problem in this way. 括号内为什 I find these problem are easy （） . I found ___ not easy to work out the problem, The studients found ____ easy to work out this math problem i found a different way to ____ this problem This math problem ________. This isn’t ________ easy work.I can’t finish it in ________ This math problem is very easy.I can work it out.合并为一句 I will try my best to solve this problem,but it not easy to This maths problem is and I can do it .A easy；easily B easil （急!）：It isn't easy for him to work out this problem.I though