问题
选择题
.
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
答案
答案：D
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.
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
答案：D
