I was really surprised at the difficulty he had ______ English.  [ ]

A. learning    

B. learnt      

C. to learn      

D. learns

关于细菌性肝脓肿的临床表现，下列哪项是错误的

A．起病急、寒战、高热

B．肝肿大、肝区疼痛

C．黄疸

D．白细胞计数增高，明显左移

E．体温表现为稽留热