一成年男性患者，暴饮暴食后突发上腹部剧烈疼痛一天，并伴发热、恶心及呕吐，实验室检查白细胞明显升高，临床拟诊为急性胰腺炎

以下最符合急性胰腺炎的超声表现的是（）。

A.胰管串珠状扩张

B.胰腺弥漫性肿大，回声减弱或强弱不均

C.胰腺合并囊肿

D.胰管内结石

E.小网膜囊积液

He ___________ unwisely, but he was at least trying to do something helpful.

A．may have acted

B．must have acted

C．should have acted

D．would act