The weather is cool and it's just right _____ walking.(用介词填空)Jim's math teacher is _____ medium build.(用介词填空)His couin is studying _____ his Chinese test at home.(用介词填空)
问题描述：
The weather is cool and it's just right _____ walking.(用介词填空)
Jim's math teacher is _____ medium build.(用介词填空)
His couin is studying _____ his Chinese test at home.(用介词填空)
答