Ioftendoexercise     themorning,but     SundaymorningI...

问题详情：

 I often do exercise      the morning, but      Sunday morning I listen to the radio.

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

【回答】

A

知识点：介词和介词短语

题型：选择题