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Standard English Conventions Difficulty: Medium

Every last second of space shuttle mission STS-79, which lasted ten days and three hours, blank carefully monitored by a team of experts.

Which choice completes the text so that it conforms to the conventions of Standard English?

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Explanation

Choice C is the best answer. The convention being tested is subject-verb agreement. The singular verb "was" agrees in number with the singular subject "every last second."

Choice A is incorrect because the plural verb "have been" doesn’t agree in number with the singular subject "every last second." Choice B is incorrect because the plural verb "are" doesn’t agree in number with the singular subject "every last second." Choice D is incorrect because the plural verb "were" doesn’t agree in number with the singular subject "every last second."