.The symbolic one-hour switch-off first in Sydney in 2007 has become an annual global eve

发布时间：2020-08-16 09:34:39

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The symbolic one-hour switch-off first      in Sydney in 2007 has bee an annual global event.
A. to hold
B. being held
C. to be held
D. held

网友回答

A. to hold
B. being held
C. to be held
(答案→)D. held
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