You can't see the sun ... a. at the nights b. at the night c. at nights d. at night

The correct option is d. at night. We say "at night" to mean during the night. The other options are not standard English. "At the night" is incorrect because we don't use "the" with "night" in this general sense. "At nights" is sometimes used to mean every night, but "at night" is the common expression.

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