自考365为考生们精心整理了学位英语/成人英语三级“每日一练”习题（2017年4月23日），欢迎积极参与学习！更多精彩信息，请关注本站。

An army spokesman stressed that all the soldiers had been ordered _____ clear warning before firing any shots.

A）to issue B）being issued C）to have issued D）to be issued