4、y.Ⅲ.单项选择题(每题一分,共15分)根据语境或句意,选择可填入句子的最佳选项,将其编号在答题卡上涂黑。31.There _______ a lot of trees here, but now it has become desert.A.was B. areC. used to be 32.“_______haveyoubeenlivinghere?”“Fortenyears.”A.HowoftenB.HowsoonC.Howlong33.Ican_______swimnorskate.Wil