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：句意：有很多健康問題，如果得不到及時處理的話可能會變得很糟糕。此處非謂語動詞做條件狀語，其邏輯主語是health problems，被動關(guān)系，一般式，相當(dāng)于when they are not treated in time。注意BCD三個選項與A項的區(qū)別：B表示非謂語動詞的動作與謂語動詞同時發(fā)生；C項表示非謂語動詞的動作發(fā)生在謂語動詞之后；D項表示非謂語動詞的動作發(fā)生在謂語動詞之前。選A。
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