【題目】Where’s my pencil box?

—I________ know.

A. aren’t B. don’t

C. isn’t D. be not

【答案】B

【解析】句意:-我的鉛筆盒在哪里?-我不知道。aren’t不是;don’t不;isn’t不是,主語是單數(shù);be not是動詞的原形。句中know是一個實意動詞,否定句應該用助動詞do構(gòu)成,故應選B。

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