Behcet病诊断的必要条件是皮肤损害。
参考答案：错
学习迁移的定义是什么心理学家关于迁移有哪些看法并选择两个理论详细阐述。
--- I let my secretary call you several times. Do you know that?
---- I _______ in a meeting. I’m sorry.
A．had been
B．was
C．am
D．have been
