3．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 having been treated

分析 有一些健康問題，當(dāng)他們不能被及時(shí)治療時(shí)，隨后會(huì)發(fā)展成更大的問題．

解答 答案：A．
原來完整的句子為There are some health problems that，when it is not treated in time，can become bigger ones later on．這里省略了 it is．表示被動(dòng)，屬于狀語從句的省略用法．to be done 表將來和被動(dòng)，常用作賓語補(bǔ)足語．表示主語讓別人做，to do主語親自做．用在此處不合適；故選A．

點(diǎn)評(píng) 在時(shí)間、條件、讓步等狀語從句中，如果從句的主語和主句的主語一直，且從句中含有be動(dòng)詞，或者從句中主語為it時(shí)，可以省略從句中的主語和be動(dòng)詞．

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