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General MCQs
Parts of Speech
Synonyms and Antonyms
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Related pair of words
Active and Passive voice
Preposition
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Idioms and Phrases
Vocabulary Building
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Question Details
They have been working on the project ___ last month.
A. From
B. Since
C. For
D. At
The correct preposition is "since," indicating the starting point of their work on the project.