—Why did you laugh just know?

—Ted was telling us ______ very funny story, but he forgot ______end of it. [ ]

A. a, an

B. a, the

C. the, a

D. the, the

为保证良好的电气连通，扁钢与扁钢搭接长度为扁钢宽度的（）倍，焊接时要做到三面焊接。圆钢与扁钢搭接长度为圆钢直径的（）倍，焊接时要做到双面焊接。圆钢与建筑物螺纹主钢筋搭接长度为圆钢直径的（）倍，焊接时要做到双面焊接。

A.1，10，10

B.2，10，10

C.1，5，5

D.2，5，5