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—Where is Tom?
—I last saw him in the library reading.
A．sit B．seated C．seating D．sat
－Where is Tom?
－I last saw him ________ in the library reading．
A．sit
B．seated
C．seating
D．sat
－Where is Tom? I have something important to tell him．
－I last saw him _________ in the library reading．
sit
seated
seating
sat