A、  B、  C、  D、  C应该仔细观察图片中没有人以及桌子上物品的状态和位置。

(A)Some people are shaking hands.
(B)Some people are putting papers into a briefcase.
(C)Some people are washing the windows.
(D)Some people are exchanging business cards.

(A)The vase has been emptied of flowers.
(B)Towels have been stored in a cupboard.
(C)Utensils have been placed in a jar.
(D)Dishes have been piled into the sink.