[ Tenses ]
They’ve _____ all weekend.
A. study
B. been study
C. studies
D. been studying
Select your answer:
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TOEFL Grammar › ViewEngineers _________ for work on the new space program.
A. are needed
B. hopefully
C. next month
D. necessary
Grammar & Vocabulary › View
The population of the earth ____________ dramatically over the years, and this is causing many problems for our planet.
A. is growing
B. grew
C. has grew
D. has been growing