Most customers are pleasant but some are unhappy because __. A．they don't think the skill to make coffee is necessary for students B．they think the cafe should be open for business C．they feel that the work is hard for students D．they think the special coffee is too expensive

A.they
B.they
C.they
D.they

【参考答案】

B
从第四段可知，有些人对咖啡屋不属于纯商业而感到不满意。