That’s all for the introduction to your arrangements these days. So now there are any que

问题补充：

That’s all for the introduction to your arrangements these days. So now there are any questions, I’d like to go ahead and start the first video.

A. if

B. unless

C. until

D. though

答案：

A. if

(答案→)B. unless

C. until

D. though

解析：A.假如B.除非…否则C.直到D.尽管句意：这些就是这几天对你安排的介绍。现在除非有问题，否则我就去开始播放第一个视频。故选B