Grammar Quiz

[ Vocabulary ]

The effort that people devote to a task for which they are paid

A. Efficiency
B. Labor
C. Opportunity cost

Select your answer:
         


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Past PerfectSimple Present and Present Continuous TensesSimple Compound and Complex SentencesRoot WordModals of ObligationSo or SuchGerund or InfinitiveAuxiliaries VerbThe Future Simple Tense

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