It()ten years since they settled down here填空

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It()ten years since they settled down here填空

It()ten years since they settled down here填空
It()ten years since they settled down here
填空

It()ten years since they settled down here填空
is 保证正确.有人会说用has been,has been语法上也 正确 ,也是对的.但是 It is + 一个时间段 +since 这种用法比用has been 常见得多 .已经是一个 约定俗成 的固定的使用方法.这个知识点高中里经常强调.