His recommendation that Air Force investigates the UFO sighting was approved by

游客2025-05-04 1

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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