题目

 With the successful launch of Tiangong-I, which was ______ breakthrough in space field, China's space dream took a step closer to ______ reality. A a; /                       B. the; a              C. a; the                    D the; / 答案：A“Well done, John! Not a single mistake____in your exam paper this time!”said the teacher．A．you madeB．did you makeC．had you madeD．you have made