过原点的直线与圆x2+y2-2x-4y+4=0相交所得的弦长为2，则该直线的方程为（ ）。
y=2x
—David has made great progress recently.
—_____, and _____. Keep up the good work, Tom.
A. So he has; so you have
B. So he has; so have you
C. So has he; so have you
红白理事会
