—Hi, Mary. It never entered my head that you’d come. What a surprise!

—I’m on a business trip in the city and I ______ in on you.

A．dropped

B．drop

C．had dropped

D．have dropped

隋炀帝对薛道衡、王胄作诗的态度体现了专制君主对（）的垄断。

A、美德

B、真理

C、才华

D、人性