Bob asked his mother to buy new shoes for him．hut she refused． （ ）
Bob asked his mother to buy new shoes for him．hut she refused． （ ）
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setTimeout("buy()",20)表示的含义是()。 A.间隔20秒后，buy()函数被调用一次B.间隔20分钟后，buy()函数被调用一次C.间隔20毫秒后，buy()函数被调用一次D.buy()函数被持续调用20次
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