Because a cycle of lunar phases ______blank 29.5 days to complete, it’s possible to observe two full moons in a single month, one at the beginning and one at the end.
Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: D
Explanation
Choice D is the best answer. The convention being tested is subject-verb agreement. The singular verb "takes" agrees in number with the singular subject "a cycle of lunar phases."
Choice A is incorrect because the plural verb "are taking" doesn’t agree in number with the singular subject "a cycle of lunar phases." Choice B is incorrect because the plural verb "have taken" doesn’t agree in number with the singular subject "a cycle of lunar phases." Choice C is incorrect because the plural verb "take" doesn’t agree in number with the singular subject "a cycle of lunar phases."
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