【題目】 I ________ know his telephone number.

A. isn’t B. don’t C. am not

【答案】B

【解析】

試題分析：句意：我不知道他的電話號碼。因?yàn)閗now是實(shí)意動詞，所以變成否定句時(shí)，應(yīng)該加助動詞do的適當(dāng)形式。故選B。

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