They usually have a party the evening October 1st.A. in inB. on inC. on ofD. on on

问题补充：

They usually have a party the evening October 1st.

A. in, in

B. on, in

C. on, of

D. on, on

答案：

A. in, in

B. on, in

(答案→)C. on, of

D. on, on

解析：考查介词。在具体的某一天用介词on，根据短语on the evening of…..,故选C。