It was __________ computer games that cost the young man a lot of precious time that he

should __________ on his lessons．

A．to play; be spending

B．playing; spend

C．played; have spent

D．playing; have spent

男性，62岁，近3个月逐渐出现上腹部不适，进食后饱胀、嗳气，纤维胃镜发现大弯侧胃壁上1cm大小块状肿物，与周围组织界限不清，病理回报恶性。

该疾病治疗最关键是（）

A.切除范围距肿瘤边缘6~8cm

B.彻底清除淋巴结

C.术后坚持化疗

D.早诊早治

E.设法保留部分胃底