The house rent is expensive. I've got about half the space I had at home and I'm paying         here.[ ]

A. as three times much            

B. as much three times

C. much as three times            

D. three times as much

在导线测量中，四等边角网的测距相对中误差应（）。

A．≤1/10万

B．≤1/12万

C．≤1/15万

D．≤1/18万