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
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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
因为时间状语是:on weekends,表示每周周末都是这样,所以用一般现在事,第三人称单数加S
选择A

选a...b应该是is playing ,c跟b一样,d的话,is plays 有两个动词了,肯定不对

a.plays

经常发生的事情用一般现在时。Mary是第三人称单数,谓语应加s.
b 格式错误
c 现在分词不能独立作为谓语
d 格式错误