.In order to prevent the fire spreading some of the houses nearby before the firemen arri

问题补充：

.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

答案：

A. have been pulled down

B. have pulled down

(答案→)C. had been pulled down

D. had pulled down

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