河南成教 / 大学英语4
正确率：100%
2[单选题]
That matter is so _ _ _ _ _ _ _ that it must not be discussed outside this office.
A.confidential
B.private
C.confident
D.mysterious
That matter is so _ _ _ _ _ _ _ that it must not be discussed outside this office.
参考答案：
佳题速递：