By the time I got there, she [ ]
A. left
B. had left
C. leaves
D. has left
答案：B
根据汉语提示，在句中填写适当的短语。
1. We must_____(保护环境)around us in order to make our homeland more beautiful.
2. Everyone of us should devote ourselves to keeping (生态平衡)．
3. Let's __ (收拾干净)the broken glass before someone walks on it．
4. It is everyone's duty to save the _ (能源)．
5. We often __ (利用)these waste things to make something else.
有一底面宽度为b的钢筋混凝土条形基础，其埋置深度为1.2m，取条形基础长度1m计算，其上部结构传至基础顶面处相应于作用的标准组合为：竖向力Fk，弯矩Mk。已知计算Gk(基础自重和基础上土重)用的加权平均重度γG=20kN/m3，基础及施工地质剖面如图所示。
黏性土层①的天然孔隙比e0=0.84，液性指数IL=0.83，试问，修正后的基底处地基承载力特征值fa（kPa），与下列何项数值最为接近（）
提示：假设基础宽度b＜3m。
A．172.4
B．169.8
C．168.9
D．158.5
