问题

Hello! Is MrJohn in the office?— YesBut I’m sorryHe is busy _________ and can’t speak to you

A:at once
B:at present
C:at the end
D:at first

正确答案是：

同类题型

Do you mind my smoking here — _________________. It’s a public place.

247 The narrow passage _______ the bigmountain for one mile

—Those scientists invented a robot to care for kids!—It’s not surprising. They ________ wonders all the time.[ ]

Facts prove that the world’s economic development is not a win-lose game but one in which all _____ be winners.

It’s difficult to make your dream come true you can live bravely, excitingly and imaginatively.