【单选题】.I was about to leave for work ______the telephone rang.
【单选题】I was about to leave _____ the telephone rang.
【单选题】多效蒸发中,由于温度差损失的影响,效数越多,温度差损失越大,分配到每效的有效温度差就( )。
【单选题】I was about to leave _____ the telephone rang.
【单选题】I was about to leave my house ______ he came.
【单选题】样本 取自总体 , , ,则以下结论不成立的是
【单选题】I was about to leave my house______ the telephone rang.
【单选题】I was about to leave my house_____the phone rang.
【简答题】I ______ (本来昨天要去看你的), but someone came to see me just when I was about to leave.