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

試題分析：句意：已經(jīng)檢查完門是關(guān)著的，所有的燈都滅了，這個男孩打開了他的臥室的門。這里逗號后是一個句子，逗號前是非謂語動詞的形式，and連接的是Having checked的兩個賓語，賓語從句不缺成分故用that，故選B。
點評：本題難度適中。這里考查的賓語從句的連詞，that在賓語從句中不做成分，一般可省略，但是當(dāng)有兩個從句并列時，后面的從句的連詞that不能省略。
即學(xué)即練：Did he point out ______ you were wrong?
A. why     B. that      C. when      D. where
解析：D。句意：他有沒有指出你什么地方錯了？