皮皮学，免费搜题
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【单选题】
def f(st): st.append('x') st=['a'] f(st) print(st) 执行后的结果是:A.
['x']
B.
['a']
C.
['a', 'x']
D.
['x', 'a']
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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