Question

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

Answer 1

D

解析:

考查名詞性從句。該空引導賓語從句，根據句意“辦公室中沒人知道她為什么如此生氣”可判斷選D項。