When _____, the museum will be open to the public next year.

A. completed
B. completing
C. being completed
D. to be completed
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科目：高中英語 來源：陜西省期末題 題型：單選題

When _____, the museum will be open to the public next year.
[     ]
A. completed
B. completing
C. being completed
D. to be completed

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