______, the conference began.A．The candidates having taken their seatsB． The can_刷题宝

题干

______, the conference began.

A．The candidates having taken their seats

B． The candidates had taken their seats

C．Taken their seats

D． Taking their seats

上一题下一题 0.64难度单项选择更新时间:2016-08-15 05:34:01

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