看到一句It is 3 years since he joined the army.和一句It has been three hours since he left his office.is和has been可以互换?

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• 看到一句It is 3 years since he joined the army.和一句It has been three hours since he left his office. is和has been可以互换?
• 看到一句It is 3 years since he joined the army.和一句It has been three hours since he left his office.is和has been可以互换?
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