it's eight o'clock in the morning.it's time for the students----their English teacher.A.listen,B .to listen,C .listen to, D. to listen to.

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it's eight o'clock in the morning.it's time for the students----their English teacher.A.listen,B .to listen,C .listen to, D. to  listen  to.

it's eight o'clock in the morning.it's time for the students----their English teacher.A.listen,B .to listen,C .listen to, D. to listen to.
it's eight o'clock in the morning.it's time for the students----their English teacher.A.listen,B .to listen,C .listen to, D. to  listen  to.

it's eight o'clock in the morning.it's time for the students----their English teacher.A.listen,B .to listen,C .listen to, D. to listen to.
D
It's time for sb.to do sth.
listen to 听

选D 前三个都是介词 如果表示具体的某一时刻用at 一般做时间状语 如果只表陈述一个时间一般不用介词 而D是副词 表示的是大约 重在提示现在时刻不是准确

D.it is time for sb. to do sth.