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【参考答案】

interlocked 改为 interlocking。
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单项选择题
A．He never keeps his promises.B．He is crazy about parties.C．He has changed his mind.D．He is not sociable.
A．He never keeps his promises.
B．He is crazy about parties.
C．He has changed his mind.
D．He is not sociable.
填空题
在free后面加them(或者：free在前面加get)。
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