英语三级B级
A．had begun
B．has been on
C．has begun
D．had been on
【考点】动词时态
【解析】会议开始了五分钟，for five minutes为一段时间，要求谓语动词要用延续性动词，故A和C先排除；而从句的动作发生在主句动作之后，故用过去完成时态。
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