Nobody could be sure Mr Goldman did it so well.A. howB. whichC. whatD. that

问题补充：

Nobody could be sure Mr Goldman did it so well.

A. how

B. which

C. what

D. that

答案：

(答案→)A. how

B. which

C. what

D. that

解析：四个选项分别表示怎样、哪一个、什么和那个，根据题意选A，没有人感确定古德曼先生是如何把它做得这么好的。