–Mr Zhu, can I go to meet you at four tomorrow afternoon?

–All right, I _____ to my office from a conference by then．I will be waiting for you there．

A．have come back

B．will come back

C．will have come back

D．will be coming back

1972年（）提出生物膜的“流动镶嵌模型”，该模型突出了膜的（）性和膜蛋白分布的（）性。