mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays

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mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays

mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays
mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays

mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays
选A
on weekends表述的是一个现在的时间~
所以用一般现在时~

选A,on weekends表示通常做的事,用一般现在时。BCD格式都不对
B项be+doing,mary是第三人称不能用am,C现在分词是非谓语动词,不能用作谓语,D项is+doing

选a,从on weekends知道了时间是一般现在时的时间,所以整句话属于一般现在时,所以动词就应该用一般现在时,所以要选a