There are some health problems that,when

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问题 There are some health problems that,when_________in time,can become bigger ones later on.A.not treatedB.not being treatedC.not to be treatedD.not have been treated

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

答案 A

解析 句意:有一些健康问题,如果得不到及时治疗,可能会发展成更大的健康问题。分析句子成分和句意可知,when引导时间状语从句,且从句的逻辑主语是some health problems,treat与逻辑主语之间为动宾关系,因此用被动语态,相当于when?they are not treated in time。从句中省略了主系结构they are,故选A。
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