—I don't know why Denise started crying when I mentioned the wedding.

—It ______ what you said about her brother. Or, perhaps she is just nervous. [ ]

A. should have been  

B. couldn't have been

C. could have been

D. must have been

NWS的高位电门位于什么位置？

A、驾驶舱头顶面板

B、前遮光板

C、前仪表板

D、中央操纵台