Ididntseeyouatthebeg的精選

問題詳情：—Ididn'tseeyouatthebeginningofthepartylastnight.—I________onmybiologyreportatthattime.     A．worked   B．work C．wasworking D．amworking【回答】C根據時間狀語“atthattime”可知是表示在過...