three days前用on还是for

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前边用介词for，造句：

1.She has been missing for three days now and police are beginning to fear the worst.现在她已经失踪三天了，警方担心发生了最坏的情况。

2.The poor devils have been stuck at the airport for three days.那些可怜的家伙被困在机场已经三天了。

3.Connection to the gas supply was delayed for three days.接通煤气延迟了三天。

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