---It’s difficult to get to the other side of the river．
---I think a bridge ________ over the river．
| A．should build | B．should be built |
| C．will build | D．has been built |
---It’s difficult to get to the other side of the river．
---I think a bridge ________ over the river．
| A．should build | B．should be built |
| C．will build | D．has been built |
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