题目内容
________ 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
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题目内容
________ 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