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a problem help

来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/10/04 18:49:23
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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