—Look! Everything here is under construction.
—Oh, has the building once __________ for exhibition been pulled down, too?
| A．being built | B．been built | C．to be built | D．built |
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—Look! Everything here is under construction.
—Oh, has the building once __________ for exhibition been pulled down, too?
| A．being built | B．been built | C．to be built | D．built |
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