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theyoftenheardthesoundofsoldiersontheplayroundAdoingexerciseBdoingexerciesexercise解释为锻炼时不是不可数的吗

题目详情
they often heard the sound of soldiers___on the playround A doing exercise B doing exercies
exercise解释为锻炼时不是不可数的吗
▼优质解答
答案和解析
A.可数.如:a bench on which a weightlifter lies to do exercises.
举重的人躺着做运动的椅子.
不明白的再问哟,请及时采纳,多谢!