What were the earliest Americans doing for those many centuries?问:doing是非谓语还是谓语

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What were the earliest Americans doing for those many centuries?问:doing是非谓语还是谓语

What were the earliest Americans doing for those many centuries?问:doing是非谓语还是谓语
What were the earliest Americans doing for those many centuries?问:doing是非谓语还是谓语

What were the earliest Americans doing for those many centuries?问:doing是非谓语还是谓语
与were一起作谓语,是过去进行时的表达.
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doing非谓语 were是谓动

非谓语,