the nature programme __ at 15 minutes later aa.ends b.start c.watches 选哪个?为什么?

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the nature programme __ at 15 minutes later aa.ends b.start c.watches 选哪个?为什么?

the nature programme __ at 15 minutes later aa.ends b.start c.watches 选哪个?为什么?
the nature programme __ at 15 minutes later a
a.ends b.start c.watches
选哪个?为什么?

the nature programme __ at 15 minutes later aa.ends b.start c.watches 选哪个?为什么?
a
自然课15分钟后结束
start没有用单数形式,所以不对
watches这里根本解释不通

end at
start from
watch,人才会watch节目不会watch
选a