whit all the audience------,the speech beganA,sat b.seating c.seated d.having seated 为什么选B而选C

whit all the audience------,the speech beganA,sat b.seating c.seated d.having seated 为什么选B而选C
whit all the audience------,the speech began
A,sat b.seating c.seated d.having seated 为什么选B而选C

whit all the audience------,the speech beganA,sat b.seating c.seated d.having seated 为什么选B而选C
第一个单词是不是应该是with啊?
the audience 与seat 的关系是主动关系,是观众坐下,而不是被动关系观众被坐下,所以选B.