This maths problem is very difficult . [ ] A. to work it out B. to be worked out C. to work out D. to be worked out it 题目和参考答案——青夏教育精英家教网—

题目内容

This maths problem is very difficult ______.

[　　]

A. to work it out　　　B. to be worked out

C. to work out　　　　 D. to be worked out it

答案：C

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