A:①a②d③c④
B:①b②a③c④d
C:①a②c③b④d
D:①c②b③d④a
下列作家、作品、朝代及出处有误的一项是( )
化简x2-y2x-y的结果( )
— Have you packed ______ well? We are leaving for the airport now.
—Yes, I am ready.