• 2022-06-07
    It's[u]      [/u]ancient story and it tells us how to be[u]      [/u]good learner.
    未知类型:{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181}
    A: a; a
    B: an; an
    C: an; a
    D: a; an