单项选择题
（）the lake around our university was seriously polluted.
A.In timeB.At no timeC.In times to comeD.At one time
未知题型 People haven‘t realized the seriousness which this earthquake has caused.
单项选择题 He departed （）to catch the train onlyto find his ticket was left in home.
未知题型 It seems inevitable for people to make such a mistake.
