[ Prepositions ]

I have been studying ___ half an hour.
a. until
b. since
c. for

Select your answer:

Random Topics:
Good vs. WellPresent Continuous TenseSimple Past Future Tense

Next quiz: Grammar

While the teacher. ………..on the board , Ali fell asleep.

A. Was writing
B. Wrote
C. Is writing
D. Writing

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