Alice buy a Chinese book two weeks ago.=Alice has had.

问题描述:

Alice buy a Chinese book two weeks ago.=Alice has had.

Alice buy a Chinese book two weeks ago.(同义句)
= Alice has had the Chinese book for two weeks.
Alice两周前买这本书.= Alice已经拥有这本书两周了.
这是把一般过去时变为现在完成时.