There are some health problems that, when ______ in time, can become bigger ones later on.
A．not treatedB．not being treated
C．not to be treatedD．not have been treated
A

試題分析：句意：有一些健康方面的問題，如果不及時(shí)治療的話，后來問題會越變越大的�？瞻滋幍耐暾Y(jié)構(gòu)應(yīng)是they are not treated。當(dāng)主句和從句的主語是一致，且謂語動詞是be動詞的某種形式，這時(shí)可以省略主語和謂語動詞。故A 正確
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