男性，48岁。体检发现多发性肾结石入院。实验室检查：血钙3.1mmol/L，血磷0.7mmol/L。24小时尿钙210mg。胃镜检查：胃窦前壁溃疡。

根据患者情况，诊断首先要考虑（）。

A.原发性肾结石

B.继发性肾结石

C.高钙血症

D.甲状旁腺功能亢进

E.以上都不是

—Where _____ Mary have put the empty bottles?

— She _____ them away. They must be somewhere.

A．can; can’t have thrown

B．must; needn’t

C．must; must have thrown

D．can; mustn’t have thrown