More new machines will be bought to __________ the old ones.

A．replace with

B．take place

C．make place for

D．take the place of

符合条件的3G后付费用户，初始信用额度须不低于用户所选择套餐金额的多少倍（）

A.3倍

B.2倍

C.4倍

D.1倍