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 having been treated
A

試題分析：考查狀語從句的省略句：句意：有很多健康問題，如果得不到及時(shí)處理的話可能會(huì)變得很糟糕。此處非謂語動(dòng)詞做條件狀語，其邏輯主語是health problems，被動(dòng)關(guān)系，一般式，相當(dāng)于when they are not treated in time。當(dāng)主從句的主語一致的時(shí)候，可以省略從句的主語和be動(dòng)詞。選A。
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