There are some llealth problems that,when_________in time,can become bigger ones 1ater on.

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问题 There are some llealth problems that,when_________in time,can become bigger ones 1ater on.

选项 A、not treatecl
B、not being treatecl
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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