有助于胰腺癌的鉴别诊断和病情监测的肿瘤标志物是（）
A.CA125
B.SCC
C.CEA
D.CA19-9
E.AFP
参考答案：D
He was elected ______ president of the company, and _____ news came , in fact, as ______ surprise. [ ]
A. a; the ; /
B. /; the ; a
C. a; /; the
D. the; the; a
