—Are you satisfied with her answer? — Not at all. It couldn’t have been .A. worseB. so bad

问题补充：

—Are you satisfied with her answer?

— Not at all. It couldn’t have been .

A. worse

B. so bad

C. better

D. the worst

答案：

(答案→)A. worse

B. so bad

C. better

D. the worst

解析：“否定词+比较级”表示最高级含义。答语中Not at all暗示了不能选C。