B.It's time for sth.如:It's time for lunch.是时候吃午饭了.It's time to do sth.如:It's time to go to bed.是时候睡觉了. It's time to go to school.是时候该上学了.
BIt's time for + n.的固定搭配
应该是B吧，有点搅混乱了。。。。
B.for
