A-A+
His recommendation that Air Force (investigate
问题详情
His recommendation that Air Force (investigates) the UFO sighting (was) approved (by the mommission) and referred (to) the appropriate.
A．investigates
B．was
C．by the mommission
D．to
参考答案
正确答案：A
解析：recommendation的同位语从句应该用虚拟语气，故将investigates改为(should) investigate。
