问题
选择题
_____ a written permission, he had to write another letter to the president of the university. [ ]
A. Not giving
B. Not having been given
C. Having not given
D. Having not been given
答案
答案:B
_____ a written permission, he had to write another letter to the president of the university. [ ]
A. Not giving
B. Not having been given
C. Having not given
D. Having not been given
答案:B