题干
（2015·重庆）—Hello Jenny, can I see Ms. Lewis?
—____ I'll tell you're here.
—____ I'll tell you're here.
A：With pleasure.
B：Never mind.
C：You're welcome.
D：Just a minute.
答案(点此获取答案解析）
D
，变量
增加一个单位时（ ）