题目内容
When you don’t know some words in reading, it is not a good idea in a dictionary at once.
A. look up them B. looking up them
C. to look them up D. look them up
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题目内容
When you don’t know some words in reading, it is not a good idea in a dictionary at once.
A. look up them B. looking up them
C. to look them up D. look them up