We don’t have a party the morning of October 1st.A. inB. onC. forD. at

问题补充：

We don’t have a party the morning of October 1st.

A. in

B. on

C. for

D. at

答案：

A. in

(答案→)B. on

C. for

D. at

解析：在英文中，在只要有天的时间前用介词on，本题有个1号，故本题选B。