Having checked the doors were closed, and all the lights were off, the boy opene

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

答案：B

整个句子的主语是the boy，前面是现在分词作状语，check后面是一个that引导的宾语从句，句中的that省略了。and应该连接两个并列的成分，所以空格处也应该是引导宾语从句的连接词that。注：当谓语动词后面接多个以that引导的宾语从句时，第一个宾语从句的连词that可以省略，其他不能省略，最后的并列成分用and that连接。