해커스인강, 해커스텝스, 해커스텝스인강, 텝스인강, 텝스강의, 텝스인강환급

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동사관련
문법좀 | 2015.10.27 | 조회 984
Within the crush of spectators at the concert ( ) several undercover security guards hired to help keep order



1. Was

2. Were

3. Has been

4. Have been



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