There are some health problems that, when__________ in time, can become bigge...

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问题 There are some health problems that, when__________ in time, can become bigger oneslater 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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