Question

When he reached the final line,everyone_____laughing.

A．burst into

B．burst out

C．burst up

D．broke out

Answer 1

B

短语辨析。A闯入，爆发出（后面常接名词的复数形式）；B突然…起来；（后面常接doing）C崩溃，突然发怒；D(战争，火灾的)爆发；本题横线后面接了laughing，故选B。句意：当他到达终点线的时候，所有的人都大笑起来。