when we got there ,we saw him ___ at the table .A work B to work C was working D working为什么选D

问题描述:

when we got there ,we saw him ___ at the table .A work B to work C was working D working
为什么选D

see sb. doing 指看到某人的时候他正在干某事

see sb doing sth
看见某人正在做某事
固定搭配

see sb doing 看见某人做某事(固定搭配)