问题补充:
There are eight tips in Dr.Rogers lecture on sleep,and one of them is: to bed early unless you think it is necessary.
A. doesn go
B. not to go
C. not going
D. don go
答案:
A. doesn go
B. not to go
C. not going
(答案→)D. don go
解析:考查特殊句式。句意:在Roger博士关于睡眠的讲座里面共有八点忠告,其中之一是:除非你认为有必要,否则不要太早上床睡觉。分析句子结构可知,冒号后的句子是一个祈使句,故选D项。