He was overlooked when they choosing a new manager which came as a complete surprise to

问题补充：

He was overlooked when they choosing a new manager, which came as a complete surprise to him.

A. set out

B. set about

C. set off

D. set up

答案：

A. set out

(答案→)B. set about

C. set off

D. set up

解析：句意: 选任新经理时没有考虑他，这完全出乎他的意料。set about 后接doing sth 表示 “着手；开始做某事”；而set out to do sth 开始做某事；set off出发；启程；引起；set up开办；设立；张贴；升起。