【題目】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. don't go D. not going

【答案】C

【解析】解析：Roger博士的報(bào)告中關(guān)于睡眠的八個方法，并且其中之一就是如果不是你認(rèn)為必需就不要上床太早。根據(jù)題干中的標(biāo)點(diǎn)冒號可知，空后是祈使句，祈使句以動詞原形開頭，否定形式在句首加don’t，故選C。

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