—What’syourtrouble,boys?              —TheMathsproblemi...

問題詳情：

— What’s your trouble, boys?

               — The Maths problem is too difficult 　　　.

          A. for us to work out

          B. for us to work out it  

          C. for us to work it out

          D. that we can’t work it out

【回答】

A

知識點：相似 相近詞比較

題型：選擇題