—How much shall I pay for the food?
—You          .This is free of charge.
A．mustn’tB．needn’tC．shouldn’tD．couldn’t
B
考查情態(tài)動(dòng)詞。needn’t沒(méi)有必要。句意——食物我應(yīng)當(dāng)付多少錢？——你不必了，這是免費(fèi)的。
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