Much to my surprise, the eight-year-old boyfixed my computer within ten minutesA. skillfu

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(答案→)A. skillfully
B. immediately
C. normally
D. nervously
解析：skillfully技巧熟练地，符合题意。由Much to my surpris 可推测出 the eight-year-old boy应该技巧熟练。Immediately立即的；normally正常的；nervously紧张的。