---It’s difficult for the villagers to cross the river.
---I think a bridge______ over the river.
| A．should be built | B．is being built | C．has been built | D．was built |
---It’s difficult for the villagers to cross the river.
---I think a bridge______ over the river.
| A．should be built | B．is being built | C．has been built | D．was built |
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