问题补充:
Cindy shut the door heavily and burst into tears. No one in the office knew she was so angry.
A. where
B. whether
C. that
D. why
答案:
A. where
B. whether
C. that
(答案→)D. why
解析:句意:Cindy狠狠的关上门哭了起来,办公室里没人知道他为什么如此生气。where 在哪儿;whether 是否;that 引导陈述句的宾语从句.