Its 9:30 pm children! is time to go to bed.A. ThatB. ItC. ThisD. They

问题补充：

Its 9:30 pm, children! is time to go to bed.

A. That

B. It

C. This

D. They

答案：

A. That

(答案→)B. It

C. This

D. They

解析：考查固定句式。It’s time to do sth.“到做某事的时候了”。句意“9：30了，到上床睡觉的时间了。”故选B。