一半径为R的光滑圆环竖直放在水平向右的场强为E的匀强电场中，如图所示，环上a、c是竖直直径的两端，b、d是水平直径的两端，质量为m的带电小球套在圆环上，并可沿环无摩擦滑动，已知小球自a点由静止释放，沿abc运动到d点时速度恰好为零，由此可知（　　）

A．小球所受重力与电场力大小相等

B．小球在b点时的机械能最小

C．小球在d点时的电势能最大

D．小球在c点时的动能最大

She got stuck in a terrible traffic jam on the highway to Shanghai, or she     dinner with her family now.

A．will be having

B．would be having

C．is having

D．was having