FIDIC施工合同条件下，为使承包商有较充裕的流动资金用于施工，而允许承包商以保留金保函代换保密金的前提是，保留金已累计扣留到保留金限额的（ 　）％。

A．30

B．40

C．50

D．60

I have had my bike     , and I'm going to have somebody       my radio tomorrow.

A．repair, to repair

B．repairing, to be repaired

C．repaired, repair

D．to repair, repairing