要不是昨天去学校，我就看不到他在操场上打篮球了。If I hadn't gone to school yesterday, I __________ him playing basketball on the playground.
A. wouldn't have seen
B. wouldn't see
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一空一词。每去一次，我的药量就减少一些，最后医生告诉我说，不必再服药了。With each visit, the does of medicine prescribed to me would be progressively reduced 1)____ the time came 2)_____ the doctor said that I would no longer need them.
编写图形用户界面程序，引入包正确的语句是（）。
A. import java.swing;
B. import java.swing.*;
C. import javax.swing.*;
D. import javax.awt.*;
如有对象f0，将其加入容器 f 的语句正确的是（ ）。
A. f0.add(f);
B. f.add(f0);
C. this.add(f);
D. this.add(0);
创建一个标签，正确语句是（）。
A. JFrame f=new JFrame("成绩管理");
B. JLabel l1=new JLabel("姓名");
C. JTextField t1=new JTextField();
D. JButton b1=new JButton("添加");
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