以抛物线y²=4x的焦点为圆心，半径为2的圆的方程为[ ]

A.x²+y²-2x-1=0

B.x²+y²-2x-3=0

C.x²+y²+2x-1=0

D.x²+y²+2x-3=0

The recommendation he gave me is that I ____ more traveling to open my eyes.

A．will do

B．could do

C．should do

D．must do