Those who would know details about this work, even to this day, are not forthcoming with information relating to the government projects, so one can assume that whatever the work was, it was and is still deemed critical to the defense and security of the United States. Whatever work was ...
Many people feel that the United States () (have) a very complicated tax collection system. A. has B. have C. had D. being have 查看完整题目与答案 You () (not change) much since we met last year. A. aren’t change B. didn’t change C. were’t change D. haven...
24() A.During B.As for C.Between D.At A. Football is the most popular sport in the fall in the United States. The originated as a(an) (21) sport more than sy-five years ago. It is still played by almost every college and university in the country, and the football stadiums ...