He ______ his bike so he has to walk there. [ ]

A. lost

B. has lost

C. had lost

D. loses

下列哪种肝炎病毒的基因组为DNA（）

A.甲型肝炎

B.乙型肝炎

C.丙型肝炎

D.丁型肝炎

E.戊型肝炎