There are some health problems that, when ______ in time, can become bigger ones later on.
A、
not treated
B、
not being treated
C、
not to be treated
D、
not have been treated
【正确答案】
A
【答案解析】
连词when之后为状语从句的省略，非谓语动词treat的逻辑主语即为主句主语health problems，它们之间的关系为被动关系，故本题选A。
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