—Do you know what Millie and Andy were doing at 8 o'clock yesterday?

—As Millie _____ TV, Andy _____ the door to welcome Tom. [ ]

A. was watching: was opening

B. watched; opened

C. was watching; opened

D. watched: was opening

诊断主动脉瓣关闭不全的重要体征是（）

A.心尖区Austin-Flint杂音

B.水冲脉

C.主动脉瓣区舒张期杂音

D.心尖区第一心音减弱

E.靴形心