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【题目】Please ask your English teacher for help if you _________ the words.

A. don't knowB. won't knowC. didn't knowD. aren't knowing

【答案】A

【解析】

句意:如果你不认识这些单词,请向你的英语老师求助。don’t know不认识,一般现在时;won’t know一般将来时;didn’t know一般过去时;aren’t knowing现在进行时。句中if引导的是条件状语从句,主句是祈使句,从句中应用一般现在时,故应选A

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