题目

 I’d appreciate ______ if you would like to teach me how to use the expression once more and I always appreciated _______ me with my English in the past．        A． that; you to help                                 B． this; you helping                               C． it; you to help                                    D． it; your helping⊙O1的半径为4，⊙O2的半径为2，两圆的圆心距为1，则两圆的位置关系是（ ）A．内含B．内切C．相交D．外切