参考答案

正确答案：B
解析：rarely：很少，不常。seldom：很少，不常。She seldom showed her feelings．她很少流露她的感情。rarely和seldom是否定副词。放在句首时引起倒装。Rarely(or Seldom)have I heard such beautiful singing．我很少听到这么优美的歌声。continuously：连续不断地。The river flows continuously along the frontier of the country．这条河沿着国家的边境绵绵不断地流着。usually：通常。Influenza usually breaks out in winter．流感常见于冬天。