It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at请说明为什么

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It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at请说明为什么
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It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at请说明为什么
It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at
请说明为什么

It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at请说明为什么
It's seven o'clock in the evening.It's time (B.for) dinner.
现在是晚上七点.到吃晚餐的时间了.
It's time for sth,到了做某事的时间.这里要用介词for表示“对于……”.

for
it is time for(后跟名词)
it is time to do sth(跟动词的用法)
到了该做什么事情了,这个句式,没有其他的介词用法

It's seven o'clock in the evening.It'time(B.for )dinner.