Our manager ________ for Shanghai in a few days and he has asked me to find out when the earliest plane ________ next Wednesday.

A．is leaving; takes off

B．will leave; is taking off

C．leaves; will take off

D．is to leave; is going to take off

西周宗法制的最大特点是（）

A.嫡长子继承制

B.兄终弟及制

C.宗法制与分封制互为表里

D.王位世袭制