一、单项选择从下列每题所给的选项中，选择一个最佳答案．
1．I don't think it is _____ useless competition，because it has offered us ____valuable experience for the next competition．（ ）
A．the； a B．an；/ C．an； a D．a；/
2．Yang Jiang，a famous writer and translator，passed away last month ________ the age of 105，she translated many famous foreign novels ________ Chinese during her life．（ ）
A．at； in B．on； in C．at； into D．of； into
3．﹣﹣﹣What are you doing？﹣﹣﹣I'm reading the book ______you lent me last week．（ ）
A．what B．who C．when D．that
