He took up my cellphone and made a long distance call as if the phone _____ him.

A．belonged to

B．was belonging to

C．was belonged to

D．had been belonged to

计算，其中Ω为z²=x²+y²，z=1围城的立体，则正确的解法是（）。

A.A 

B.B 

C.C 

D.D