选择题：Some 40 percent of the hired hands left before the

题目内容：

Some 40 percent of the hired hands left before they（）their term of service.

A.finish
B.finished
C.would finish
D.have finished

参考答案：

The government had them permission to leave the co

The government had them permission to leave the country.A attributedB qualifiedC

在弯曲和扭转变形中，外力矩的矢量方向分别与杆的轴线（）。 (A）垂直、平行；（B）垂直；（C）平行、垂直；（D）平行

Zora’s hometown had a/an _1_ Negro population and non-blacks were only ever seen

I often tell [_][_][_][_] I should searve the people better.A meB mineC myselfD

下列各项年金中，只有现值没有终值的年金是（）。A A. 普通年金B B. 即付年金C C. 永续年金D D. 先付年金