previously可以修饰过去完成时吗?还是previously修饰完成时时,完成时就要用过去完成时?
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previously可以修饰过去完成时吗?还是previously修饰完成时时,完成时就要用过去完成时?
previously可以修饰过去完成时吗?还是previously修饰完成时时,完成时就要用过去完成时?
previously可以修饰过去完成时吗?还是previously修饰完成时时,完成时就要用过去完成时?
可以修饰 用过去完成时
如the Native Americans had previously ceased to be part of the widespread culture