.In order to prevent the fire spreading, some of the houses nearby _____before the firemen arrived.
| A．have been pulled down | B．have pulled down |
| C．had been pulled down | D．had pulled down |
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.In order to prevent the fire spreading, some of the houses nearby _____before the firemen arrived.
| A．have been pulled down | B．have pulled down |
| C．had been pulled down | D．had pulled down |
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