拔牙的术中并发症有（）
A.牙龈组织撕裂伤
B.牙根折断
C.牙槽骨损伤
D.牙槽窝血凝块形成
E.下牙槽神经损伤
参考答案：A, B, C, E
There was a half smile on his face which suggested that he＿＿＿＿happy to have given his life for his country.
A．was
B．should be
C．would be
D．were
序列两两比对
