男性，62岁，胃溃疡病史3年，一年来上腹痛发作频繁，无规律，体重减轻。

此时最适宜的治疗为（）。

A.胃癌根治术

B.胃大部切除术+肝转移癌切除术

C.姑息性手术

D.大剂量化疗

E.放疗

At the beginning of class, the noise of desks _____ could be heard outside the classroom. [ ]

A. opened and closed

B. to be opened and closed

C. being opened and closed

D. to open and close