摘要：look, if, new, you, them, to, don’t, a, up, in, know, spell, words, how, dictionary, .
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If you don’t know how to spell new words, _________ in a dictionary.
A. look them up B. look up them C. look them after D. look them for
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If you don’t know how to spell new words, _________ in a dictionary.
| A．look them up | B．look up them | C．look them after | D．look them for |
If you don’t know how to spell new words, _________ in a dictionary.
| A．look them up | B．look up them | C．look them after | D．look them for |
up them