与原发性肝癌有关的病毒是
A.HAV
B.HIV
C.HBV
D.HCV
E.EBV
参考答案:C
凡是5的倍数,个位上一定是______或______.
—I wonder why Mr. Green looks quiet in class. —I'm not sure, but he ()a small accident driving here.
A. could have
B. might have
C. might have had
D. must have had