【題目】Don’t watch TV. You _______ do your homework first.

A. mustn’t B. needn’t C. must

【答案】C

【解析】

試題分析：句意：不要看電視，你必須先寫完作業(yè)。A. mustn’t 禁止，情態(tài)動(dòng)詞；B. needn’t 不必，沒有必要；情態(tài)動(dòng)詞；C. must必須，情態(tài)動(dòng)詞。情態(tài)動(dòng)詞+動(dòng)詞原形。needn’t，同義詞don′t have to。根據(jù)句意，故選C。

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