[ Vocabulary ]
The cost of producing one more unit of a good
A. Interest
B. Productivity
C. Marginal
Select your answer:
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Grammar & Vocabulary › ViewThe little girl cannot stop giggling when her dad __________ her under her arms.
A. slap
B. press
C. wash
D. tickle
Conjunctions › View
You won’t pass the exam ______ you study.
A. before
B. because
C. unless
D. as