问题
选择题
There are some health problems that , when _______ in time , can become bigger ones later on.
A．not treated
B．not having treated
C．not to be treated
D．not having been treated
答案
答案：A
题目分析: 考查非谓语动词。从句子结构可知动词treat和逻辑主语health problems之间是被动关系，而且是指普遍性情况，所以答案选A。句意：有一些健康问题，当不被及时治疗时，以后可能会成为大问题。