should表义务的用法 — 英语选择题
题目
绿色小组的值日卡写着：“离开花园前，每组都要给小树浇水。”哪句话用 should 表达这项义务？A. We should water the young trees before we leave. B. We should waters the young trees before we leave. C. We shouldn't water the young trees before we leave. D. We should watering the young trees before we leave.