He said couldn’t he work out the problem but his teacher didn’t know how to do it.A. thou

问题补充：

He said couldn’t he work out the problem but his teacher didn’t know how to do it.

A. though

B. never

C. hardly

D. not only

答案：

A. though

B. never

C. hardly

(答案→)D. not only

解析：如果选用B项或C项，题干中不能使用not，故排除。正确答案是D。