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


  1. A.
    to issue
  2. B.
    being issued
  3. C.
    to have issued
  4. D.
    to be issued
A
解析：
本题考查不定式作主语补足语的用法及非谓语动词的时态和语态。order sb．to do sth．命令某人做某事句中的order是以被动形式出现的，故其后应接不定式作主语补足语。又因issue（发布）的宾语是clear warnings，且该动作尚未发生，故选不定式的一般式作主补。
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