Engineers _ working on a new project for the last three days.
Correct answer: C. Have been
- A. Are
- B. Has been
- C. Have been
- D. Ought to be
Explanation
The given sentence is an example of the "present perfect continuous" tense, indicated by its structure. 'Engineers' is a plural noun, so it must also be followed by a plural verb. Hence, "have been" is the correct option.
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