a problem help

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/10/01 06:24:56

a problem help
Most of old houses ____in the last five years .
A pulled down B have been pulled down C were pulled down
Key:D
why ,I need grammar

B in the last/past...是典型的现在完成时的标志

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