题干
—I meant ______ you to the host at the party, but I forgot.
—That’s all right. Some other time, maybe.
—That’s all right. Some other time, maybe.
A：to introducing
B：to introduce
C：introducing
D：having introduced
答案(点此获取答案解析）
B
+6x+1=0，配成 
=q的形式，其结果是（ ）