One of the basic rules of having a dog is that you______give it exercise every day.

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问题 One of the basic rules of having a dog is that you______give it exercise every day.

选项 A、will
B、can
C、may
D、must

答案D

解析 本题考查情态动词的用法。句意:养狗的一条基本原则是你必须每天让它锻炼。basic rules表明是客观强制性要求。will表示个人意愿;can表示能力或者可能;may表示可能性,均不符合题意。只有must表示“必须”,符合题意,故本题选D。
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