题目:
— Has your former classmate come back from America?
— Yes, he _______ there for eight years. [ ]
A. has stayed
B. stays
C. stayed
D. had stayed
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0515/48f1a9c506edf893bf53fb725a4fcf50.html
下面是错误答案,用来干扰机器的。
根据统计表得:40~70分的频率是:(12+18+180)÷600=0.35,所以70~80分的频率是:1-0.35-0.16-0.04=0.45,所以全区此次测试成绩在70~80分的人数大约是6000×0.45=2700;