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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Early on Saturday morning Ann brought her nephew(侄子) Sam to her friends, Bill and Kate, and asked them to look after him for the day．Sam, an independent boy of six years old, had black hair and was we...
A.
living alone
B.
habitually taking actions or decisions alone
C.
earns enough money to live on
D.
not controlled by others