A-A+
His recommendation that Air Force investigates
问题详情
His recommendation that Air Force investigates the UFO sighting was approved by the commission and referred to the appropriate.
A．investigates
B．was
C．by the commission
D．to请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A应改为(should)investigate。
解析：同位语从句修饰recommendation，从句用虚拟语气。
