【题目】Some students want to ride their bicycles in the campus but the school rule tells them ______.
A.not to
B.not to do
C.not do it
D.do not do

【答案】A
【解析】不定式后和前文重复的部分常省略而只保留不定式符号to；not to=not to ride their bicycles in the campus；句意：许多学生想在校园骑自行车，但是学校规定告诉他们不能。根据句意，故选A。