A、  B、  C、  B所给出的问题询问还未发生的事情的时间。要注意不要只听到问题中的When，start等词就选择选项(A)。另外还要注意问题中的show(n．演示)和选项(C)中的show(v.出示，把……给人看)的含义

Do you think you could plug in the projector for me?
(A)Sure, Where’s an outlet?
(B)You can turn it off now.
(C)I’ll finish the project by six.

When should we start the slide show?
(A)It started yesterday.
(B)Let’s start in ten minutes.
(C)Yes, I’ll show you after work.