题目

---Have you seen _______empty box?---Do you mean ________ box you showed to me yesterday? I put it in your school bag.A. a; the B. an; the C. an; a D. the; a 答案：【答案】B【解析】第一次提到某物时，用不定冠词，又根据empty 的第一个音标为元音音标，故选an，当第二次再提到该物时，用定冠词the ，故选CThere are many trees on both sides of the street.A.every side B.all sidesC.each sides D.each side