What does the underlined word mean in the following sentence?J’ai une demi-sœur qui habite avec moi.

In French, “demi-sœur” means “half-sister”: a sister who shares one biological parent with you. The sentence says, “I have a half-sister who lives with me.” A step-sister is usually called a “belle-sœur” in French, so choice D is correct.

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