I would go with D. It’s important to keep family and culture traditions alive.
. As is often said, knowledge is power, and power in the wrong hands can be dangerous. ... If you yourself are faced with an opportunity to gain knowledge and later apply it, you must decide whether the potential benefits are worth any harm that may be done as a result.
The answer is: [D]: "will have" .
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"On Friday Vanessa <u> will have </u> been travelling for a month."
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