Not only, the students but also, their instructor --- been called to the principal's office.
Correct answer: A. has
- A. has
- B. have
- C. were
- D. was
Explanation
The correct answer is has because the construction 'Not only...but also' typically treats the closest subject as the primary subject for verb agreement. In this case, 'instructor' is singular, thus requiring the singular verb 'has'. The options 'have' and 'were' are incorrect because they are plural verbs that do not correspond with the singular subject. Although 'was' is singular, it does not fit the context of the sentence as well as 'has', which implies a more immediate action in this scenario.
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Biotechnology in health care applies biological organisms, cells or enzymes to diagnose and treat disease. The subject includes recombinant DNA, genetically engineered insulin, vaccines, antibiotics, monoclonal antibodies, gene therapy and techniques such as polymerase chain reaction, while distinguishing therapeutic applications from agricultural and industrial biotechnology.
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