The factory was built in a secret place, around ______ high mountains.

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is ; building has been ; built is ; being built is ; to be built

is building； takes    is being built； will take
   is built； will take    is being built； takes

will be built is built has built will have been built

consistent conscious confidential conscientious

which was it was which were them were

is being built is building is built is being building

which was it was which were them were

was built is built will be built built

is building； takes is being built； will take is built； will take is being built； takes

is building； takes is being built； will take is built； will take is being built； takes

built be built to be built being built

will be built has built will have been built is built

is built was building has built was built

where it that Which

is building； takes is being built； will take is built； will take is being built； takes

is building; takes is being built; will take is built; will take is being built; takes

where it that which

is/ building has /been built is /being built is /to be built

the place where where what the place what