—Is this your bicycle David? —No its not . Its Helens.A. hisB. mineC. yoursD. hers

问题补充：

—Is this your bicycle, David? —No, its not . Its Helens.

A. his

B. mine

C. yours

D. hers

答案：

A. his

(答案→)B. mine

C. yours

D. hers

解析：句意：这是你的单车吗，David？不，这不是我的，她是Helen的。A他的；B我的；C你的；D她的；结合题意选B。