.
The symbolic one-hour switch-off first _____ in Sydney in 2007 has become an annual global event.
A.to hold | B.being held | C.to be held | D.held |
相关知识点
推荐套卷
.
The symbolic one-hour switch-off first _____ in Sydney in 2007 has become an annual global event.
A.to hold | B.being held | C.to be held | D.held |