缩窄性心包炎（）
A.肺性发绀
B.心性混合性发绀
C.淤血性发绀
D.缺血性发绀
E.混合性发绀
参考答案：C
— Sorry, the tickets have already been sold out.
— Really? Maybe I ________ a little earlier.[ ]
A. should come
B. should have come
C. could have come
D. must have come
违约金
