While riding in the street, .A. someone called me from behindB. I heard my name called C.

While riding in the street, .
A. someone called me from behind
B. I heard my name called
C. my bike broke down
D. an old man knocked down

A. someone called me from behind(答案→)B. I heard my name called C. my bike broke downD. an old man knocked down解析：这题考查状语从句的省略式，当主从句的主语一致时，可以省略从句中的主语和be动词，由此可以推断，主句的主语是I，所以选B。

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