If you don’t know how to spell the new word, please in the dictionary.A. look atB. look t

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A. look at
B. look them up
C. look up it
(答案→)D. look it up
解析：look at看；look up向上看，查阅；句意：如果你不知道如何拼写这个新单词，请在字典里面查阅它。此处代词指代的是前面word，单数用名词用it，it主格宾格形式一样，人称代词做动词短语宾语是要放在动词后面，介词前面。故选D。