Brian really has to work on _______ his vocabulary. ... | GrammarQuiz.net

Topics: Preposition & Gerund

Brian really has to work on _______ his vocabulary.

A. improve

B. improved

C. improving

D. improves

Select your answer:

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Comparative and Superlative Adjective If Clauses Demonstrative Pronouns Future Tense and Conditionals Vocab Checking Present, Past and Future Tense Collocations & Tenses Preposition of Time Subject and Verb Agreement Intermediate

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A. at

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