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

 

A

【解析】

試題分析：句意：有一些健康方面的問(wèn)題，如果不及時(shí)治療的話，后來(lái)問(wèn)題會(huì)越變?cè)酱蟮摹？瞻滋幍耐暾Y(jié)構(gòu)應(yīng)是they are not treated。當(dāng)主句和從句的主語(yǔ)是一致，且謂語(yǔ)動(dòng)詞是be動(dòng)詞的某種形式，這時(shí)可以省略主語(yǔ)和謂語(yǔ)動(dòng)詞。故A 正確

考點(diǎn)：考查省略結(jié)構(gòu)

 

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