The boy is said ________ across the busy road when suddenly a car cut in and knocked him over. [ ]

A. to be cycling    

B. to have cycled

C. to have been cycled    

D. to cycle

在一般情况下，动产所有权和不动产所有权的转移( )。

A．均以交付为准
B．均以登记为准
C．分别以登记和交付为准
D．分别以交付和登记为准