I‘m watching a basketball match,It started at 7pm and__on for another half an hour.Awill be B has been怎么选,后面的时间状语怎么分析的呢?也就是说用什么时态?

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I‘m watching a basketball match,It started at 7pm and__on for another half an hour.Awill be B has been怎么选,后面的时间状语怎么分析的呢?也就是说用什么时态?
I‘m watching a basketball match,It started at 7pm and__on for another half an hour.
Awill be B has been
怎么选,后面的时间状语怎么分析的呢?也就是说用什么时态?

I‘m watching a basketball match,It started at 7pm and__on for another half an hour.Awill be B has been怎么选,后面的时间状语怎么分析的呢?也就是说用什么时态?
for another half an hour
是将来的时间,another :one more; an added another chance
再一小时,另外一小时,当然是说话之后一个小时,所以用将来时态.
on 是副词,持续的意思.
be on ,持续,will be on ,将持续.

B, 现在完成时,是说从过去开始但一直未完

A 将会持续多长时间。

用的是被动语态.