Question

There is a policeman _____ the bus. He is watching the traffic.

A．in front of	B．in the front of
C．in the front	D．the front

Answer 1

A

in front of 介词短语表示“在……前面”（外部）; in the front of 介词短语表示“在……前面”（内部）; in the front 在前面; the front前方，前线，故选A。