They used what they had _____ for their daughter.

A．to buy a new dress

B．buying a new clothes

C．bought a new suit

D．buy a new clothing

某投资方案的净现金流量如下表所示(i_c=12%)，其动态投资回收期为( )年。

A．年份

B．0

C．1

D．2

E．3

F．4

G．现金流出

H．0

I．50

J．50

K．50

L．50

M．现金流入

N．100

O．10

P．10

Q．10

R．10