His sister___________ her hometown for two years. She’ll return next year.

A．has been away

B．has left

C．has been away from

D．left

典型软下疳的组织病理特征中描述正确的是（）

A.溃疡基底层为大量淋巴细胞、浆细胞和少量成纤维细胞

B.溃疡基底层为多形核白细胞、血管内皮细胞和新生的毛细血管

C.溃疡基底层为多形核白细胞、纤维素及坏死组织

D.深层为大量淋巴细胞、浆细胞和少量成纤维细胞