[ TOEIC Grammar and Vocabulary Review ]
The researchers ………………….. hard to develop a perfect new model over the last two years.
A. work
B. worked
C. are working
D. have been working
Select your answer:
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Past PerfectAdjectives and VocabularyDefinite vs Zero Article Abstract NounsSimple Present Negative and QuestionApostrophes and GrammarGrammar - ConnectorsFuture Perfect ContinuousGrammar - SimilesArticles and PrepositionsPrepositions of MovementOther quiz:
Grammar › ViewSarah _____ end up at the wrong house if you do not provide her with directions.
A. might
B. must
C. shall
D. should
Vocabulary › View
All this snow might be annoying right now, but it will _______ our community later by preventing us from having another drought.
A. deliberately
B. dismay
C. subside
D. benefit