My parents will work the farm the morning of June 15.A. in, inB. on, onC. in, onD. on, i

My parents will work the farm the morning of June 15.
A. in, in
B. on, on
C. in, on
D. on, in

A. in, in(答案→)B. on, onC. in, onD. on, in解析：句意：我的父母将在6月15日的早晨在农场上班。这里是短语on the farm在农场；在具体的某一天应该用介词on。故选B。考点: 考查介词的用法。

谢谢回答！！！