Selling appliances and （ ） them keep him busy.

Selling appliances and （ ） them keep him busy.
A、to repair
B、repaired
C、repairing
D、repair
【正确答案】：C
【题目解析】：句意：售卖与维修家电让他非常忙碌。and表并列，前面动词用的ing形式，后面的动词也要用ing形式。