单击命令按钮时，下列程序的执行结果是（ ）。Private Sub Book(x As Integer)x=x * 2 + lIf x＜6 ThenCall Book(x)End IfX=X * 2 + 1Print x；End SubPrivate Sub Command2_Click()Book2End Sub
A．package testpackage；public class Test{ }
B．import java.io.* ；package testpackage；public class Test{ }
C．import java.io.*； class Person{ }public class Test{ }
D．import java.io.*；import java.awt.*；public class Test{ }