Kathy has wasted so much time playing failing in the exam.A. soB. thusC. andD. otherwise

问题补充：

Kathy has wasted so much time playing, failing in the exam.

A. so

B. thus

C. and

D. otherwise

答案：

A. so

(答案→)B. thus

C. and

D. otherwise

解析：“Kathy 浪费很多时间玩，因此没有通过考试。”so“因为”但是连词， thus副词，符合此句，答案B。