the concert began.A. The listeners having taken their seatsB. Having taken their seatsC.

问题补充：

, the concert began.

A. The listeners having taken their seats

B. Having taken their seats

C. Having taken their places

D. Taking their seats

答案：

(答案→)A. The listeners having taken their seats

B. Having taken their seats

C. Having taken their places

D. Taking their seats

解析：独立主格做状语。主语concert 不可能执行take the seat 这一动作，必须加the listeners 做逻辑主语