. The symbolic one-hour switch-off first
题型:选择题
问题:
.
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
.
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