问题补充：
He took the machine to pieces to find out how it .
A. progressed
B. operated
C. equipped
D. managed
答案：
A. progressed
(答案→)B. operated
C. equipped
D. managed
解析：词义辨析。Progresse前进，进步； operate操作，经营；equip装备，配备；manage经营，处理；句意：他把机器拆成一块一块的来查明他如何操作。故选B。
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