问题描述：
高一英语单项选择(请说明选择理由)
------------,the concert began.
A.The lisheners having taken their seats
B.Having taken their seats
CHaving taken their places
D.Taking their seats
------------,the concert began.
A.The lisheners having taken their seats
B.Having taken their seats
CHaving taken their places
D.Taking their seats
问题解答：
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