—Kim, I haven’t seen your mother for so long, where is she?

—Oh, she ________________ England to learn further studies(深造). She left a month ago.

A．have been to

B．has gone to

C．has been in

D．have been

驻车制动器太松、刹不牢的原因之一为钢丝绳变长，排除方法是（）。

A.缩短钢丝绳长度，更换蹄片

B.缩短钢丝绳长度

C.更换蹄片

D.更换弹簧