Question

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 having been treated

Answer 1

A

試題分析：考查狀語從句的省略：句意為：有些健康問題，如果不及時(shí)處理，以后會變得更嚴(yán)重。when not treated in time 為插入語，在本句中為時(shí)間狀語從句，把that can become bigger ones later on 這個(gè)定語從句給隔開了。when 引導(dǎo)時(shí)間狀語從句時(shí)，可以出現(xiàn)省略的現(xiàn)象，但必須滿足兩個(gè)條件：首先，時(shí)間狀語從句中的主語必須和主句主語一致；其次，從句中含有be 動(dòng)詞。本句中補(bǔ)充完整的狀語從句為：when they are not treated in time，其它選項(xiàng)形式不對。故答案為A 項(xiàng)。