The platform was crowed with people ___goodbyeto friends and relatives.a.to waveb.wavedc.wavingd.to be waving
问题描述：
The platform was crowed with people ___goodbye
to friends and relatives.
a.to wave
b.waved
c.waving
d.to be waving
答
crowed拼错了吧!crowd聚集，crowded
答
C
people 和wave 是主动的关系,而且动作正在进行
用现在分词正合适.