Two chairs are beside the desk.The bookcase is behind the desk.I have English dictionary and some Chinese books~my bookcase.①、A、a B、am C、the D、/ ②、A、of B、at C、under D、on （选哪个?）
问题描述：
Two chairs are beside the desk.The bookcase is behind the desk.I have English dictionary and some Chinese books~my bookcase.①、A、a B、am C、the D、/ ②、A、of B、at C、under D、on （选哪个?）
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