题目

 - How do you like your English teacher?  - He is so great. We _______friends since he came to our school a year ago.     A. were         B. have made         C. have been       D. have become 答案：C15．把54拆成A、B、C、D四个数的和，使得A+2=B-2=C×2=D÷2，则A=10．