题目内容
Having checked the doors were closed, and ________ all the lights were off, the
boy opened the door to his bedroom.
boy opened the door to his bedroom.
| A.why | B.that | C.when | D.where |
B
B [连接词that引导第二个宾语从句,不具有任何意义,但一般不能省略。]
练习册系列答案
相关题目