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    16、-- Has Tommy finished his homework yet?

    -- I have no idea; he __________ it this morning．

    A．was doing         B．had been doing          C．has done          D．did

    16、A

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    -- Has Tommy finished his homework yet?

    -- I have no idea; he __________ it this morning．

    A．was doing         B．had been doing          C．has done          D．did

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