–Tom what’s the matter with you? You look so worn out!--Nothing serious. I my new house

问题补充：

–Tom, what’s the matter with you? You look so worn out!

--Nothing serious. I my new house all the day and I am afraid I won’t finish until tomorrow afternoon.

A. have whitewashed

B. am whitewashing

C. have been whitewashing

D. shall be whitewashing

答案：

A. have whitewashed

B. am whitewashing

(答案→)C. have been whitewashing

D. shall be whitewashing

解析：考查时态。现在完成进行时通常与时间状语all the day, all the morning等连用，表示一直以来都在做的事情，而且持续到现在。句意：—Tom，你怎么了？你怎么看上去很疲惫啊？—没关系。我一整天都在粉刷我的新房子，恐怕要到明天下午才能结束。根据句意是指一整天都在做，故选C项。