—I remember I left my laptop in the study last night. Why ________ here?

—Oh, I thought you might need it so I brought it here for you.[ ]

A. does it come

B. has it come

C. had it come

D. will it come

在自动调节系统中，（）起到了人眼的作用。

A、变送器和显示表

B、调节器

C、执行器

D、显示表