Thousands of people gathering at the wharf observed the new ocean liner____the harbor.问什么要用leaving 而不用 leave

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Thousandsofpeoplegatheringatthewharfobservedthenewoceanliner____theharbor.问什么要用leaving而不用leaveThousa

Thousands of people gathering at the wharf observed the new ocean liner____the harbor.问什么要用leaving 而不用 leave
Thousands of people gathering at the wharf observed the new ocean liner____the harbor.
问什么要用leaving 而不用 leave

Thousands of people gathering at the wharf observed the new ocean liner____the harbor.问什么要用leaving 而不用 leave
用leaving 是动名词来修饰前面的LINE 此句动词是前面的OBSERVED 所以不再需要动词 LEAVING 是动名词作定于来修饰前面的line