Can you tell me ______?[ ]

A. where does he live

B. how did he come here yesterday

C. what his job is

D. that he is good at English

关于胸腺瘤的描述，下列哪项错误（）

A.多位于前上纵隔

B.呈椭圆形或分叶状，边界清楚

C.半数以上合并重症肌无力

D.多为良性，包膜完整

E.临床上常视为有潜在恶性