In the 17th century, astronomers lacked digital technology; _________ to rely on simple optical telescopes and manual calculations.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
they had
B
you
C
he or she
D
it
Correct Answer: A
Choice A is the best answer. The subject is "astronomers" (plural). "They had" correctly matches the plural subject.
Choice B is incorrect because "you" is second person. Choice C is incorrect because "he or she" is singular. Choice D is incorrect because "it" is singular/inanimate.