2. 职称英语
  3. His recommendation that Air Force (investigate) ______ the UFO sighting was appr

His recommendation that Air Force (investigate) ______ the UFO sighting was appr

游客2023-10-09  11
问题 His recommendation that Air Force (investigate) ______ the UFO sighting was approved by the commission.
选项
答案  (should) investigate
解析 本题考查虚拟语气。句意：他建议空军对不明飞行物的出现展开调查，得到了委员会的批准。在一些表示建议、请求或命令的动词或名词后面的宾语从句中，如：recommend， suggest，order，command，demand，propose等，从句的谓语动词用 should+do来表达虚拟的情况，而且should可以省略。
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