How time flies!Three years__really a short time.我觉得填was,

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How time flies!Three years__really a short time.我觉得填was,
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How time flies!Three years__really a short time.我觉得填was,
How time flies!Three years__really a short time.我觉得填was,

How time flies!Three years__really a short time.我觉得填was,
用is,表示一陈述一般的事实
three years在此看做一个整体,所以后面的系动词用单数