有HLA-B27抗原的人()
A.易患肿瘤
B.对气管鳞癌和腺癌有保护性作用
C.易患肠道感染
D.对鼻咽癌患者预示预后不良
E.易感染病毒
参考答案:D
He spoke English so well that I took _______ for granted that he was an American.
A.that
B.this
C.which
D.it
在交通事故中当事人责任都有哪些?