1.After the high-ranking officials-----,the curtain rose and

1.After the high-ranking officials_____,the curtain rose and the play began.
A.was seated B.had seated C.were seated D.were sat
2.The old man was run down by a car.He was taken to hospital and_____on by the chief surgeon right now,
A.operated B.having been operated C.is operated D.is being operated
请说明选择的原因 说的好我会加分的