複選題29.Select the sentences that are written clearly and grammatically correctly. (A) Having finished the police report, Officer Chang closed the case. (B) Having finished the police report, the case was closed. (C) Officer Chang closed the case after he had finished the police report. (D) As soon as the police report been finished, the case was closed. (E) No sooner than the case was closed, Officer Chang had finished the police report.