What's keeping him他被什么事耽搁了?"keep"除了有“保持”之意，还有“使耽搁;使延误”的含义
"keep sb"同"delay sb/hold sb up'
例Jessica: For sure.I wonder what's keeping him.杰西卡: 是的。不知道他被什么事耽搁了。Sandy: Looks like he won't show up. He's done thisbefore, hasn't he?桑迪: 看来他不会来了。他以前也这样过，不是吗?
----摘自新英汉《60堂英语情景口语必修课》
