2. 外语
  3. His recommendation that Air Force investigates the UFO sighting was approved by the commission and referred to the appropriate.

His recommendation that Air Force investigates the UFO sighting was approved by the commission and referred to the appropriate.

admin2012-01-27  68
问题 His recommendation that Air Force investigates the UFO sighting was approved by the commission and referred to the appropriate.
选项 A、investigates
B、was
C、by the commission
D、to
答案A应改为(should)investigate。
解析 同位语从句修饰recommendation，从句用虚拟语气。
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