Which twO Words in this excerpt from The Count of Monte Cristo can be used as synonyms to determine the meaning of the word grotto? Dantès entered the second grotto. The second grotto was lower and more gloomy than the first; the air that could only enter by the newly
formed opening had the mephitic smell Dantès was surprised not to find in the outer cavern. He waited in order to allow pure air to displace
the foul atmosphere, and then went on.

Opening, cavern

Explanation:

Synonyms are words that have identical or nearly identical meanings. An example of synonyms are words present and gift. They mean the same thing and are interchangeable.

When synonyms are used in the same context and we aren't familiar with one of them, we can figure out what it means based on the other one. Words used in the given passage that help us determine the meaning of the word grotto are opening and cavern.  

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i'd say the answer is nuisance. i hope i .