高中英语

单选题 There are some health problems that, when________in time, can become bigger ones later on.

A．not treated
A．not treated
B．not being treated
B．not being treated
C．not to be treated
C．not to be treated
D．not having been treated
D．not having been treated

参考答案：A进入在线模考
本题考查省略。句意为“有些健康问题，如果不及时处理，以后会变得更严重”。when引导时间状语从句时，可以出现省略的现象，但必须满足两个条件：首先，时间状语从句中的主语必须和主句主语一致；其次，从句中含有be动词。本句中完整的状语从旬为“when they are not treated in time”。故本题选A。

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