--- How much shall I pay for the phone call?
--- You ________. This is free of charge.
A．shouldn’tB．can’tC．don’t have toD．mustn’t
C

試題分析：考查情態(tài)動(dòng)詞的否定：A. shouldn’t 不應(yīng)該     B. can’t 不能         C. don’t have to不必D. mustn’t禁止，句意：--這個(gè)電話我該付多少錢？--你不必付錢，這是免費(fèi)的。選C。
點(diǎn)評(píng); 情態(tài)動(dòng)詞要注意語氣，有的情態(tài)動(dòng)詞肯定和否定意思不一樣：must的表示“必須”mustn’t“禁止”，don’t have to=needn’t，所以平時(shí)要多識(shí)記情態(tài)動(dòng)詞的多種含義。做題時(shí)結(jié)合上下文的含義判斷。
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