单项选择题My parents used ___ they had to get a new car for me.A.whichB.thatC.whatD.all what
单项选择题生产、储存爆炸物品的主厂区应布置在非危险区的（ ）。 A.独立地带 B.上风区 C.逆风区 D.下风侧
