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 标点有时对我们作题有提示的作用。此题很容易选B,认为是不定式做表语。其实冒号已经表明后面是Dr.Roger讲的原话,这原话应当是个句子,只有选D才构成一个否定的祈使句。
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