---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 agoA.have been toB.has gone toC.has been inD.have been
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B解析have、has gone to表示主语已经离开，要么在去某地的路上或已经到莫某地，本题根据后文的内容. She left a month ago.
Has been to表示主语曾经去过某地，因而选B