His recommendation that Air Force (investigates) the UFO sighting (was) approved (by the commission) and referred (to) the appro

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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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