【简答题】It is ten years since she was a teacher.
【单选题】果蔬原料防止酶褐变引起的护色工序中,不属于关键因素的是( )。
【简答题】It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical. A.made for B.set out C.took off D.turned up
【单选题】It is ten years_____he smoked.