问题描述：
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（-----）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?
问题解答：
我来补答展开全文阅读