That man _______ our head teacher. Our head teacher has gone to town.         [ ]

A. can't be                  

B. mustn't be          

C. may not be              

D. might not be

在文档中有一个标题“办公自动化”，如何使用“字体”对话框将标题的字体设置为“楷体”，小三字号，颜色设置为“红色”