Don't you think it's very necessary__us __learn geography well.A for ,to B of ,to ,选哪个,为什么
问题描述：
Don't you think it's very necessary__us __learn geography well.A for ,to B of ,to ,选哪个,为什么
答
A
it is necessary for sb.to do sth.
对某人来说做某事是有必要的
固定搭配.
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