I oftenthe words I don’t know in the dictionary or on the Internet.A. look upB. look atC.

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(答案→)A. look up
B. look at
C. look for
D. look into
解析： 本题考查动词词组。look up意为“（在词典、参考书等中）查找，查阅”，故选A。B意为“看”；C意为“寻找”；D意为“调查”。