the class -t-for 15 minutes.A:has begun B:has been on

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the class -t-for 15 minutes.A:has begun B:has been on
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the class -t-for 15 minutes.A:has begun B:has been on
the class -t-for 15 minutes.A:has begun B:has been on

the class -t-for 15 minutes.A:has begun B:has been on
选B 15minutes是时间段,前面的动词应用持续性动词