Grammar Quiz
[ Phrasal Verbs ]

Scientists have recently …………….. research on blood lead levels of athletes.

A. carried out

B. found out

C. narrowed down

D. resort to

Select your answer:
         


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Past Perfect Tense and Past Tensemust/shouldPast simple - Irregular VerbsPassive with ModalsVerb + PrepositionPreposition and ConjunctionArticles & Compound NounsSentence CompletionComparison and Modals

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A. much

B. many

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