He found it hard for Alan to focus on his teachers for longer than five minutes, if the lecture was boring.
A. extremely
B. especially
C. basically
D. naturally
网友回答
A. extremely
(答案→)B. especially
C. basically
D. naturally
解析：词义辨析。A. 非常；极端的 B. 特别；尤其 C. 主要的；基本上 D. 自然地。句意：我发现艾伦很难注意他的老师超过五分钟，特别是当讲座令人厌烦时。故选B。