男婴，6个月。因呕吐腹泻3天，加剧1天，尿少来院急诊，体温38℃，眼窝前囟显凹，皮肤弹性较差，血Na+140mmol/L，动脉血气；pH7.2，BE12mmol/L。最适宜处理是

A．禁食6小时，以后牛奶喂养
B．静注25%葡萄糖溶液
C．静脉注射速尿(呋塞米)
D．2:3:1溶液静滴
E．1.4%碳酸氢钠静滴

We ______ four thousand new words by the end of last year. [ ]

A. learned

B. had learned

C. have learned

D. will learn