_______sending emails, I've kept in touc
题型:选择题
问题:
_______sending emails, I've kept in touch with my American friend for many years.[ ]
A. In exchange for
B. On behalf of
C. In return for
D. By means of
_______sending emails, I've kept in touch with my American friend for many years.[ ]
A. In exchange for
B. On behalf of
C. In return for
D. By means of