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The telescope on the summit of Mauna Kea captures images of celestial bodies that are not _________ to the naked eye.
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Which choice completes the text so that it conforms to the conventions of Standard English?
Question 1 of 10
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The telescope on the summit of Mauna Kea captures images of celestial bodies that are not _________ to the naked eye.
Which choice completes the text so that it conforms to the conventions of Standard English?