高等继续教育 / 大学英语I
正确率：100%
题型描述: 单选题
For a successful business, friendly and _ _ _ _ _ staff are essential.
A. efficient
B. sufficient
C. effective
D. respective
For a successful business, friendly and _ _ _ _ _ staff are essential.
A. efficient
B. sufficient
C. effective
D. respective
参考答案：
佳题速递：