It's a pen .(用a pen 改为选择疑问句）
问题描述：
It's a pen .(用a pen 改为选择疑问句）
Three and six is nine.(划线部分提问）划线是nine
It's a pen .(用a pen 改为选择疑问句）
( ) it a pen ( ) a pencil?
答
is it a pen?
what is three and six?