--We’ll have a hiking trip but when shall we meet??--Let’s make ithalf past eightthe morn

问题补充：

--We’ll have a hiking trip, but when shall we meet??

--Let’s make ithalf past eightthe morning of May 1st.

A. /; on

B. at; in

C. ./; in

D. at; on

答案：

(答案→)A. /; on

B. at; in

C. ./; in

D. at; on

解析：介词考查题。第一空half past eight相当于副词作用，前面不用介词；第二空某天的上午用介词on，所以选A。