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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 |
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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 |
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