There are some health problems that, when______ in time, can become bigger ones later on.

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问题 There are some health problems that, when______ in time, can become bigger ones later on.

选项 A、not treated
B、not being treated
C、not to be treated
D、not have been treated

答案A

解析本题考查非谓语动词及状语从句的省略。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。故选A。

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