In order to build a road,the old houses _ used to stand in front of our classroom.,请问是选B吗?但为什么不选 A呢?In order to build a road,the old houses _ used to stand in front of our classroom building have already been pulled down.A

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In order to build a road,the old houses ___ used to stand in front of our classroom.,请问是选B吗?但为什么不选 A呢?In order to build a road,the old houses ___ used to stand in front of our classroom building have already been pulled down.A

In order to build a road,the old houses _ used to stand in front of our classroom.,请问是选B吗?但为什么不选 A呢?In order to build a road,the old houses _ used to stand in front of our classroom building have already been pulled down.A