—Can I see you at 3:00 p.m. next Monday?

—I’m afraid not.I        to New York long before then.

A．have flown

B．will fly

C．am flying

D．will have flown

第二性征是指除了______以外的男女特有的征象．如：男生的______、______、______的变化；女生的______、______、______的变化，它们是受______的控制而表现出来的．