The correct phrase to complete the sentence "Lucie pense souvent" is "à sa grand-mère," which means "about her grandmother." This phrase properly follows the verb "penser" in French, indicating what Lucie often thinks about. Other options do not appropriately follow the verb structure in French. ;
The correct phrase to complete the sentence is "D. à sa grand-mère," meaning "about her grandmother." This follows the verb structure in French, where "penser" is paired with the preposition "à." Thus, the full sentence is "Lucie pense souvent à sa grand-mère."
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