Having checked the doors were closed , and _________ all the lights were off, the boy opened the doo

题目简介

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

题型：单选题难度：中档来源：不详

主要测试宾语从句。该试题主要测试动词check后接宾语从句的情况，而且句中有并列连词and。句子意思：核实完所有的门已锁好，并且所有的灯已关好，男孩开门走进自己的卧室。