15Mary ___(studys)Chinese for two years.

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15Mary___(studys)Chinesefortwoyears.15Mary___(studys)Chinesefortwoyears.15Mary___(studys)Chinesefort

15Mary ___(studys)Chinese for two years.
15Mary ___(studys)Chinese for two years.

15Mary ___(studys)Chinese for two years.
Mary has studied Chinese for two years.