20.Lien last visited a centre for children with cognitive impairments two weeks ago.
A. Lien hasn't visited a centre for children with cognitive impairments for two weeks.
B. It's two weeks when Lien visited a centre for children with cognitive impairments.
C. Lien visited a centre for children with cognitive impairments for two weeks.
D. This is the last time Lien visited a centre for children with cognitive impairments.
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