题目

I earn 10 dollars __ hour as __ supermarket cashier on Saturday.        A. a, an              B. the, a                   C. an, a          D. an, the 答案：C He served in the army in ________ when he was in ________． [　　] A．1970’s, his twenties B．1970’s, the twenties C．the 1970s, his twenties D．the 1970s, the twenties