问题：
The local government announced that only when the fire was under control ________ to return to their homes.
A．the residents would be allowed
B．had the residents been allowed
C．would the residents be allowed
D．the residents had been allowed
The local government announced that only when the fire was under control ________ to return to their homes.
| A．the residents would be allowed | B．had the residents been allowed |
| C．would the residents be allowed | D．the residents had been allowed |
参考答案：