what were they doing when they ___ ___(听说)the event?
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whatweretheydoingwhenthey______(听说)theevent?whatweretheydoingwhenthey______(听说)theevent?whatwerethey
what were they doing when they ___ ___(听说)the event?
what were they doing when they ___ ___(听说)the event?
what were they doing when they ___ ___(听说)the event?
heard about/of