题目内容
There are eight tips in Dr. Roger’s lecture on sleep, and one of them is _________ to bed early unless you think it is necessary.A. doesn’t go
B. not to go
C. not going
D. don’t go
答案:D
解析:
提示:
解析:
is后面为省略that的表语从句,该从句前面是一个祈使句的否定式。
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