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- How much shall I pay for the phone call? - You ．This is free of charge． [ ] A．

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- How much shall I pay for the phone call? - You ．This is free of charge． [ ] A．

— How much shall I pay for the phone call?

— You ________．This is free of charge．

[]

A．shouldn't

B．can't

C．don't have to

D．mustn't

试题答案

答案：C

解析：

据句意得此处应为“不必要”。故得C．

标签：phonethecallthisyou

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