(2013·高考浙江卷)There are some health problems that，when in time，can bee bigger ones later on.
A. not treated
B. not being treated
C. not to be treated
D. not having been treated
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(答案→)A. not treated
B. not being treated
C. not to be treated
D. not having been treated
解析：选A。题干的意思是：“有一些健康问题，如果没得到及时的治疗，在以后会变成更为严重的问题。”分析句子结构可知，此处是状语从句的省略，从句主语problems与treat之间为被动关系，故A项正确，其完整的形式为when they are not treated in time。此句实际上是分隔式定语从句。定语从句that can bee bigger ones later on被when not treated in time分隔开来了。