We had estimated the number of visitors to our school’s hundredth anniversary at about 400, but the __________ number was much higher.A.actualB.genuineC.sincereD.unbelievable
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A解析形容词辨析。actual实际的,事实上的；genuine真诚的;不造作的,由衷的；sincere真诚的；Unbelievable难以置信的。句意：……但是实际数字会更高。