crowd作名词作主语的时候谓语是用单数还是复数?

应该是接单数.

1.N-COUNT-COLL 可数集合名词人群;观众 A crowd is a large group of people who have gathered together, for example to watch or listen to something interesting, or to protest about something.【搭配模式】：oft N of nA huge crowd gathered in a square outside the Kremlin walls... 一大群人聚集在克里姆林宫墙外的广场上.It took some two hours before the crowd was fully dispersed... 大概花了两个小时才把人群全部疏散开.The crowd were enormously enthusiastic... 观众热情高涨.The explosions took place in shopping centres as crowds of people were shopping for Mothers' Day. 爆炸发生在购物中心,当时大批人群正在为母亲节购物.

2.N-COUNT 可数名词(志趣相投或工作相同的)一伙人,一帮人 A particular crowd is a group of friends, or a set of people who share the same interests or job.【搭配模式】：usu supp N【STYLE标签】：INFORMAL 非正式All the old crowd have come out for this occasion. 那些老伙计们都来参加这一庆典.