Choose the correct form: He has been working here ____ ten years.
Correct answer: B. for
- A. since
- B. for
- C. from
- D. during
Explanation
For introduces a duration such as ten years, while since introduces a starting point such as 2015. From is used with an explicit end point, as in from Monday to Friday. This pairing is one of the most frequently tested points in the grammar section.
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About Prepositions
Prepositions link a noun or pronoun to the rest of the sentence, showing place, time, direction or relation. The difficulty is idiomatic rather than logical: English fixes particular prepositions to particular verbs and adjectives, so “good at,” “married to” and “differ from” have to be learned as units rather than reasoned out.
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