Question

【题目】Jenny's math lesson is nine Friday morning.
A.in; on
B.at; on
C.on; in
D.at; in

Answer 1

【答案】B
【解析】句意：詹妮的数学是在周五早晨9点。在时刻前用介词at；在具体的某一天用介词on。故答案为B。