it was up to 的用法It was up to the US to take the initiative in repairing relations.在修复关系方面应由美国采取主动.这里的it was up to是取决与什么的意思吗?具体该怎么用?

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itwasupto的用法ItwasuptotheUStotaketheinitiativeinrepairingrelations.在修复关系方面应由美国采取主动.这里的itwasupto是取决与什么

it was up to 的用法It was up to the US to take the initiative in repairing relations.在修复关系方面应由美国采取主动.这里的it was up to是取决与什么的意思吗?具体该怎么用?
it was up to 的用法
It was up to the US to take the initiative in repairing relations.在修复关系方面应由美国采取主动.
这里的it was up to是取决与什么的意思吗?具体该怎么用?

it was up to 的用法It was up to the US to take the initiative in repairing relations.在修复关系方面应由美国采取主动.这里的it was up to是取决与什么的意思吗?具体该怎么用?
it's up to 是由……决定的意思
比如说:it's up to you.由你决定 It's up to the air. 由天气决定(看天气)
具体用法: It's up to + 名词 (+ to do sth.)

it is up to sb to do sth
取决于
up to还有多达和时间直到