The books you donated are used to _____ children in need.A.helpB.helpedC.helpingD.helps
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A解析A 考查used的用法。sth. be used to do sth.=be used for doing sth.“某物被用来做......”；sb. be used to doing sth.“某人习惯于......”；used to do sth.“过去常常做......”。“你捐赠的书被用来帮助有需要的孩子。”故选A。