Question

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

Answer 1

B

解析试题分析：句意：已经检查了门是关着灯，所有的灯都关掉了，那个小男孩打开了卧室的门。这里and连接的是并列的两个checked的宾语，the doors were closed是checked的宾语，all the lights were off也是checked的宾语。第一个宾语的连词that可以省略，第二个连词不可以省略，that在从句中不作成分，因为这两个宾语从句的都不缺少成分。故选B。
考点：考查连词的用法。