Therearesomehealthproblemsthat,when
来源:国语帮 6.02K
问题详情:
There are some health problems that, when _____ in time, can become bigger ones later on.
A. not having been treated B. not being treated
C. not to be treated D. not treated
【回答】
D
知识点:非谓语动词
题型:选择题