题型:问答题 简答题 I want to be a volunteer some day. I feel _____ is my duty to help others.A.thisB.thatC.themD.it 查看答案
题型:问答题 简答题 Why not take_______ umbrella with the sign "Made in china"? It is_______ useful one.A.an; anB.an; aC.a; anD.a: a 查看答案