【答案】Mother’s Day is ___ the second Sunday in May in the United States.

Mother’s Day is ___ the second Sunday in May in the United States.

A. on B. in C. at D. of

【答案】

A

【解析】

句意：在美国母亲节在5月的第二个星期天。在具体的某一天用介词on，故选A