In the morning the employees found the office broken into and they ________ the police immediately.
A.called forB.called onC.called atD.called in在线课程D
call in表示“召集，召请”；call at表示“拜访”，后接地点名词；call on表示“号召，请求，拜访（人）”；call for是“来找，来叫某人”等意思。根据句意选D。