2. 外语
  3. In order to prevent the fire spreading, some of the houses nearby ______ pulled down before the firemen arrived.

In order to prevent the fire spreading, some of the houses nearby ______ pulled down before the firemen arrived.

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问题 In order to prevent the fire spreading, some of the houses nearby ______ pulled down before the firemen arrived.
选项 A、have been
B、have
C、had been
D、had
答案C
解析 句意：为了防止火势蔓延，附近的房子在消防员到来之前就已经被推倒了。the firemen arrived为过去时，所以“房子被推倒”应用过去完成时。
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