【題目】根據(jù)語境從方框中選擇恰當(dāng)?shù)那閼B(tài)動(dòng)詞填空，每詞限用一次

must, can, needn't, mustn't, have to


（1）— I come in?
—Yes, please.
（2）We should be quiet in the theatre. Wespeak loudly.
（3）—Must I return this book to the library today, Mrs Brown?
—No, you
（4）—Must I stay with you, Grandpa?
—No, you don'tYou can go swimming with your friends.
（5）Webe careful when we cross the road.

【答案】
（1）Can
（2）mustn't
（3）needn't
（4）have to
（5）must
【解析】must必須, can能, needn't不必, mustn't必須不, have to不得不
⑴句意：---我可以進(jìn)來嗎？---請進(jìn)。表示請求許可，可以用can，首字母大寫，所以答案是Can。
⑵句意：在戲院我們應(yīng)該保持安靜。我們一定不要大聲喧嘩。表示禁止，在劇院不準(zhǔn)喧嘩，用mustn't。所以答案是mustn't。
⑶句意：我今天必須把這本書還給圖書館嗎，布朗夫人？---不，你不必。must提問的一般疑問句，否定回答用needn't。所以答案是needn't。
⑷句意：---爺爺，我必須跟你呆在一起嗎？---不，你不必，你可以跟朋友去游泳。have to不得不；don't have to=needn't 不必。已有don't，所以答案是have to。
⑸句意：我們過馬路的時(shí)候一定要小心。過馬路要小心是必須的事情，用must，所以答案是must。

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