Shortly after we____,a waiter came over to our table with a smile.A,seated B.

问题描述:

Shortly after we____,a waiter came over to our table with a smile.A,seated B.
Shortly after we____,a waiter came over to our table with a smile.
A,seated
B.were seated
C.sat ourselves
D.had seated
为什么不选A?B是什么时态?

B
be seated表示就座,是固定用语