what causes these sandstorms?这个句子“cause”为什么要加“s”?what(-----)to your village in recent years?-lots of roads ,buildings,parks and so on( )填的是“have happened”还是“has happened ”为什么内?

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what causes these sandstorms?这个句子“cause”为什么要加“s”?what(-----)to your village in recent years?-lots of roads ,buildings,parks and so on( )填的是“have happened”还是“has happened ”为什么内?
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what causes these sandstorms?这个句子“cause”为什么要加“s”?what(-----)to your village in recent years?-lots of roads ,buildings,parks and so on( )填的是“have happened”还是“has happened ”为什么内?
what causes these sandstorms?这个句子“cause”为什么要加“s”?
what(-----)to your village in recent years?
-lots of roads ,buildings,parks and so on
( )填的是“have happened”还是“has happened ”
为什么内?

what causes these sandstorms?这个句子“cause”为什么要加“s”?what(-----)to your village in recent years?-lots of roads ,buildings,parks and so on( )填的是“have happened”还是“has happened ”为什么内?
这句话翻译过来就是最近几年你的村庄发生了什么变化,what作主语,它是未知的,当做单数来处理,所以是has happened.上面的问题同理.

主语是第3人称单数形式cause要加s

主语是单数形式,谓语要与主语形式一致!!!