单项选择题

Every land has its own dining custom, and the Unites States is no exception. Americans feel that the first rule of being a polite guest is to be on time. If a person is invited to dinner at 6:30, the hostess expects him to be there at 6:30 or not more than a few minutes after. Because she usually does her own cooking, she times the meal so that the coffee and meat will be at their best at the time she asks the guest to come. If he is late, the food will not be so good, and the hostess will be disappointed. When the guest cannot come off time, he calls his host or hostess on the telephone, gives the reason, and tells at what time he thinks he can come.
"No exception" in the first sentence can be explained by

A. the same
B. different
C. particular
D. polite
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