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17、When _________, the new school buildings can hold as many as 10,000 students.

A.being completed                                         B.completed           

C.to be completed                                          D.is completed

17、B

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When _________, the new school buildings can hold as many as 10,000 students.

A.being completed                                         B.completed           

C.to be completed                                          D.is completed

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