问题: 模拟题2-30
---How much shall I pay for the phone call?
----You ________. This is free of charge.
A. should't B. can't C. don't have to D. mustn't
请详细写出解题的过程和思路。
解答:
C. don't have to;相当于need't;根据后一句:这是免费的,得出不必付钱;
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