2012 Jiangxi Question 57 Single-choice Differentiating 2012_江西卷 (英语) $67. A volunteer is usually expected to work within a year for at least______.$ A. 24 hoursB. 36 hoursC. 48 hoursD. 72 hours Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →