I have always been honest and straightforward, and it doesn’t matter ___ I’m talking to.

A．who is it that

B．who it is that

C．it is who that

D．it is whom that

免疫应答的基本过程包括（）

A.识别、活化、应答三个阶段

B.识别、活化、排斥三个阶段

C.识别、活化、反应三个阶段

D.识别、活化、增殖三个阶段

E.识别、活化、效应三个阶段