The maths problem is very easy I don’t think all of you can work it out.A. andB. orC. so

问题补充：

The maths problem is very easy, I don’t think all of you can work it out.

A. and

B. or

C. so

D. but

答案：

A. and

B. or

C. so

(答案→)D. but

解析：本题前句表示数学题很容易，后句却表示我认为你们所有的人都未能把它解决出来，表示的是意思的转折，用but，故本题选D。