(单选题)6: Sixteen-year-old Maria was waiting in line at the airport in Santo Domingo. She was leaving her native country to join her sister in the United States. She spoke English very well. Though she was very happy she could go abroad, she was feeling sad at leav
A: when she was leaving America
B: on her way back to Santo Domingo
C: before she left the USA
D: when she arrived at the airport
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