问题
选择题
David, _____ I have been sharing a dorm for more than two years, is quite a funny guy.
A．of whom
B．with whom
C．in whom
D．from whom
答案
B
题目分析：句意：和我住在一个宿舍两年多的David是很有趣的家伙。这里使用了定语从句，先行词是David，定语从句中使用share sth with sb，缺少介词with，可以放在关系代词whom前面，所以选B。
=1860MPa。
。又由计算知预应力钢筋损失总值∑σs=246MPa，试估算永存预加力（kN）与（）项数值最为接近。