—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)動詞。needn’t沒有必要。句意——食物我應(yīng)當付多少錢?——你不必了,這是免費的。
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