挡土墙高7m,墙背直立、光滑,墙后填土面水平,填土面上有均布荷载q=20kPa,填土情况见附图。试计算主动土压力合力的大小和作用点及作出墙背主动土压力分布图。
参考答案:
So involved in his business _________ that he can hardly accompany his wife and child at weekends.[ ]
A. the manager has become
B. becomes the manager
C. has become the manager
D. has the manager become