I have some _________ in working out the problem.A.difficulty\x05B.difficulties\x05C.troubles\x05D.difficult这道题为什么不选B?B和C有什么不一样的吗?

问题描述:

I have some _________ in working out the problem.
A.difficulty\x05B.difficulties\x05C.troubles\x05D.difficult
这道题为什么不选B?B和C有什么不一样的吗?