I don’t think the experiment is ______ failure, because it has provided us with _____ valuable experience for our future tests. A. 不填; 不填 B. a; 不填 C. a ; a D. 不填; a
---Mike has made great progress recently . ---______and ________. A. So he has ,so you have B. So has he ,so have you C. so he has ,so have you D. So has he