We had estimated the number of visitors to our school’s hundredth anniversary at about 400, but the number was much higher.
A. actual
B. genuine
C. sincere
D. unbelievable
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(答案→)A. actual
B. genuine
C. sincere
D. unbelievable
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。