We_______on this project for four hours. Let’s have a rest.

A．are working

B．have been working

C．worked

D．had worked

患者，男性，65岁。经唾液腺专家门诊以“右腮腺多形性腺瘤”收入院。以下哪项与此诊断无关

A．患者有20年大量吸烟史

B．肿物增大缓慢

C．右侧腮腺表面均可触及结节状，质硬肿物

D．肿物活动度较好

E．该肿瘤女性发病率高于男性