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Onfindingtheengineerwasworkingbadly,thepilothadtoland.这里的on

题目详情
On finding the engineer was working badly,the pilot had to land.这里的on
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On
一发现引擎不好使了,驾驶员就不得不着陆.
on 一...就.
on hearing that ,一听到那个.