The teacher will not on any account allow smoking in the classroom.
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He had no sooner begun to speak than I sensed that something was wrong.
I saw the famous scientist only once.
The students are rarely allowed to enter the teachers' reading-room.
债权人可以将债权的全部或者部分转让给第三人,但是有下列情形之一的除外
A. 根据债权性质不得转让
B. 当事人约定不得转让
C. 依照法律规定不得转让
D. 以上皆是
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