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

A． completing            B． being completed         C． completed        D． to be completed

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

　　A．completed

　　B．completing

　　C．being completed

　　D．to be completed

　　A．completed

　　B．completing

　　C．being completed

　　D．to be completed

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

[　　]

A．completed　　　　　B．completing

C．being completed　　D．to be completed

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

[　　]