He frequently visits his old uncle in his native village.

The correct answer is A. frequently.

The word “frequently” means “happening often or regularly.” The other options are:

• B. rarely: happening only a few times or not often.
• C. irregularly: happening at irregular intervals or in an unpredictable way.
• D. secretly: in a way that is not known
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In the sentence “He frequently visits his old uncle in his native village,” the word “frequently” tells us that the man visits his uncle often. This means that the answer is A.