选C
A项,being+过去分词：进行时态的被动语态.
B项,进行时态的主动语态
C项,被动语态,相当于：
When it is completed,the museum will be open to the public next year.
D,to be+过去分词：将来时态的被动语态,when引导从句应该用一般现在时态.
等完工时/如果完工,图书馆会在明年对公众开放
When ___________ ,the library will be open to the public nex
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