问题补充:
A group of children hide and seek in the garden.
A. is playing
B. are playing
C. has been playing
D. was playing
答案:
A. is playing
(答案→)B. are playing
C. has been playing
D. was playing
解析:考查时态及主谓一致。句意:一群孩子们正在花园玩捉迷藏。结合语境可知描述的是现在正在进行的动作,故用现在进行时态,主语为复数形式,故谓语动词用复数形式。选B。