Having stayed in Canada for two years, the little girl didn’t change much, ______ a little taller.  [      ]

A. only to get

B. only getting

C. to have got

D. having been got

人吸气时，肺的容量增大，肺内空气的压强__________（选填“变大”、“变小”或“不变”），在___________作用下，新鲜空气被压入肺内。