谈谈“介词+关系代词”的用法\x0d一、用法说明\x0d介词+whom只能指人；介词+ which只能指物.如：\x0dLook,there comes Tom,for whom I have waiting for an hour.瞧,汤姆来啦,我等他等了一个小时.\x0dLast Saturday ...