题目内容
.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
C
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题目内容
.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
C