The May Day Holiday____over,we must now get down to work.

问题描述:

The May Day Holiday____over,we must now get down to work.
A)be B)being C)to have been D)to be
但是为什么啊

Answer:B.前后无连词,用分词,独立主格结构 [Zhiadao.Baidu.2007-6-13]