若主调用函数类型为double，被调用函数定义中没有进行函数类型说明，而return语句中的表达式类型为float型，则被调函数返回值的类型是(　　)。

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【单选题】【消耗次数：1】

① int 型

② float 型

③ double 型

④ 由系统当时的情况而定

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