问题:
【题文】
Kangkang spent two hours ________ his bedroom last Sunday.
A.clean B.cleaning C.to clean
【题文】
Kangkang spent two hours ________ his bedroom last Sunday.
A.clean B.cleaning C.to clean
Kangkang spent two hours ________ his bedroom last Sunday.
A.clean B.cleaning C.to clean
参考答案: