Which of the following sentences does NOT have a predicative？A．You should stay calm in an

Which of the following sentences does NOT have a predicative？

A．You should stay calm in an emergency.

B．The dishes your mother cooks taste delicious.

C．He appeared sad when he heard the bad news.

D．He was doing his homework this time last night.

请帮忙给出正确答案和分析，谢谢！