胰腺癌最常见的回声类型是
A．高回声
B．低回声
C．等回声
D．混合回声
E．杂乱回声
参考答案：B
-You were not in when I came over to your house.
-Oh, I ____________ for a friend from England at the airport.
A．was waiting
B．had waited
C．am waiting
D．have waited
当归芍药汤3功效与作用
