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. I’m afraid I’ll turn to Prof. Timlingson. It is . A.too difficult a problem B.

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. I’m afraid I’ll turn to Prof. Timlingson. It is . A.too difficult a problem B.

. I’m afraid I’ll turn to Prof. Timlingson.It is        .

A.too difficult a problem

B.a too difficult problem

C.such difficult problem

D.a so difficult problem

 

试题答案

【答案】

A

【解析】略