题目内容
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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 |
D
解析
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题目内容
.
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 |
D
解析