—I haven’t seen you for ages. Where have you been?

— I _______ on leave in Europe.

A．have been

B．am

C．was

D．had been

乳腺纤维腺瘤的超声特征是（）。

A.边界光滑、有包膜、回声均匀、后方多增强

B.边界不光滑、有包膜、回声均匀、后方多增强

C.边界光滑、无包膜、回声均匀、后方多增强

D.边界光滑、有包膜、回声不均、后方多增强

E.边界光滑、有包膜、回声均匀、后方不增强