When Kate arrived at the bus stop,the bus for half an hour.a.has left b.had left c.has been away d.had been away

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• When he arrived at the bus stop,the bus_____for 20 minutes. A,has left B,had left C,has been awayD,had been away.
• When Kate arrived at the bus stop,the bus for half an hour.a.has left b.had left c.has been away d.had been away
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