Eventually最终, they gave up the project to build a bridge over the river because of the _______ high costs it would involve. A:excessively 过分地,极度 B:expensively C:effectively D:efficiently 高效的
【单选题】下面的代码合法的是 : ( ) A) public abstract method(); B) public abstract void method(); C) public abstract void method() { } ; D) public void method() implements abstract;