Which of the following sentences correctly uses the past perfect tense?

答案解析

The correct answer is B. The past perfect tense is used to indicate that an action was completed before another action in the past. In this case, 'They had left the party' occurred before 'I arrived'. Option A uses the present perfect, option C uses the past continuous, and option D incorrectly combines future tense with a past time reference.
正确答案：B
随机推荐

在神经语言程序学中，如何看待知识的拥有与转化？

假设有以下Java代码： ```java interface Shape { void draw(); } class Circle implements Shape { @Override public void draw() { System.out.println("Drawing a circle"); } } class Square implements Shape { @Override public void draw() { System.out.println("Drawing a square"); } } public class Test2 { public static void main(String[] args) { Shape[] shapes = new Shape[2]; shapes[0] = new Circle(); shapes[1] = new Square(); // 假设此处存在一条语句，能够实现遍历shapes数组并调用每个元素的draw()方法，输出对应的图形 } } ``` 在`Test2`的`main`方法中，横线处最适合的代码段是什么，使其能够正确利用多态性打印出“Drawing a circle”和“Drawing a square”?

关于图的生成树，以下说法正确的是？

以下哪种方式最能描述面向对象编程的主要思想？

在NLP实践中，以下哪个步骤是用来评估参与者状态的改变和NLP模式的效果的？
开始刷题