Little Bob is often educated by his parents to be good and friendly to anybody even if ________.[ ]

A. attacking

B. is attacked

C. to be attacked  

D. attacked

慢性缩窄性心包炎，常见病因为

A．类风湿

B．创伤后

C．急性心包炎迁延所致

D．结核性

E．心内直视手术后