The strain of all the difficulties and vexations and anxieties _more than he could bear.
Correct answer: A. was
- A. was
- B. were
- C. are
- D. have been
Explanation
In this sentence, the main subject is "The strain", which is a singular noun. Therefore, the verb must also be singular to maintain proper subject-verb agreement. The correct answer is "was", as it correctly corresponds to the singular subject.The other options do not fit because "were", "are", and "have been" are all plural forms that do not agree with the singular subject. Using these plural forms would suggest that there are multiple strains, which is not the case in this context.
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Gas behaviour is explained through the kinetic molecular theory and the relationships among pressure, volume and temperature. Work includes STP, Boyle's and Charles's laws, absolute zero, the ideal gas equation, and the distinction between ideal and real gases, especially the effects of intermolecular forces and molecular volume.
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