问题补充：
Our school plans to have a parents meeting the afternoon January 27th.
A. in, of
B. on, in
C. on, of
D. in. at
答案：
A. in, of
B. on, in
(答案→)C. on, of
D. in. at
解析：句意:我们学校计划在1月27日召开一次家长会。plan to do计划做某事；have a parents meeting召开一次家长会；在具体的某一天的下午前面应该用介词on；用介词of“……的”，根据句意故选C。
