---The meeting’s been put off until next week.

---Sorry, ______. Could you say it again?

A．I didn’t mean that

B．I didn’t know

C．I didn’t take it

D．I didn’t get it

有关DNA聚合酶作用条件说法错误的是（）

A.必须有单链DNA模板

B.底物是dNTP

C.合成方向只能是3′→5′

D.需要ATP和Mg²⁺参与

E.合成方向只能是5′→3′