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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．

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

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