题目内容

13、Having checked the doors were closed , and _________ all the lights were off, the boy opened the door to his bedroom.

   A. why           B. that           C. when           D. where

 

试题答案

13、B

解析:  注:that引导并列的宾语从句,Having checked后省去that,并列的两个以that引导的宾语从句即使省略第一个that,第二个that 一般不能省。

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