患者,女性,55岁,CT示胆总管重度扩张,在胰头上缘中断消失,形态不规则,最可能的诊断是()
A.胆总管癌
B.胰头癌
C.胆囊癌
D.胆总管结石
E.急性胆管炎
参考答案:A
I ______ English in that school since I came to the city. [ ]
A. have taught
B. am teaching
C. will teach
D. taught
一张边长1分米的正方形纸片可以剪成______个边长1厘米的小正方形.