Topics: 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:
Random Topics:
Clauses and ConjunctionsAdverb of MannerDemonstrative SpeechPresent Simple and Continuous TenseGrammar for TOEFLPerfect Progressive TensesArticles & Compound NounsNounsAnalogyConjunction: Because and SoOther quiz:
Adverb › ViewI’m not going to Sam’s party. I ___ know him! He’s your friend, not mine.
A. hardly
B. hard
Quantifiers › View
____________ nuts are there for the salad?
A. How much
B. How many