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.

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问题 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.

选项 A、doesn’t go
B、not to go
C、not going
D、don’t go

答案D

解析 对祈使句进行否定时,直接在前面加don’t。
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