问题补充:
The students often games after school. They volleyball now.
A. play, play
B. play, are playing
C. plays, are playing
D. are playing, play
答案:
A. play, play
(答案→)B. play, are playing
C. plays, are playing
D. are playing, play
解析:第一空根据often(常常)用一般现在时;第二空根据now(现在,此刻)用现在进行时。故选B。