Complete the sentence: Ben has been overseas ___ to learn three different languages.

• A. Often enough
• B. Often
• C. Sometimes enough
• D. Always enough

Answer: (A)

This question tests how to express that a level of frequency is sufficient to achieve a goal. The phrase often enough shows that the trips abroad occur frequently enough to make learning three languages possible, which fits the purpose clause “to learn three different languages.” The present perfect has been indicates ongoing relevance up to now, and overseas describes where the travels happen.

Using only often would state frequency but not imply that it’s enough to accomplish learning, which makes the meaning less precise. Sometimes enough sounds tentative and odd, while always enough overstates the frequency as guaranteeing success. So the natural, precise choice is the one that ties a normal level of travel to a successful outcome.