题干
____at the front ____some VIPs from the company．
A：Seating; wa
B：Seated; were
C：Sitting; wa
D：Sat; were
答案(点此获取答案解析）
B
A：Seating; wa
B：Seated; were
C：Sitting; wa
D：Sat; were
的定义域为（ ）
