单项选择题

Business engagements these days are also a part of social life. If you are invited to drinks in a business setting, it is generally a good idea to arrive a little later, but within half an hour of the time given. If you are not greeted by the host or hostess when you come into the party, then, you should ask for them and make yourself known. They usually will introduce you to the other guests. But if for any reason you should be left alone, it is sensible to introduce yourself to someone near at hand and make conversation. Don’ t overstay the time of the party and always thank the host and hostess as you leave.
Thanks should be repeated either by letter or telephone later on. Older people tend to prefer a written note, but those with whom you are on more friendly terms will be pleased to receive a telephone call.
If it is a business dinner, your host or hostess will tell you whether you are expected to come with a partner. Sometimes only business is to be discussed among men and women present, so that even husbands and wives may not be included. You should arrive on time for the dinner as there are always some arrangements of seats by the table.
If you are acting as host with a colleague or boss, then you must stay to the end. You’ d better thank whoever is the normal host (even if you have done all the work). On such a business occasion, you should be fully aware of the purpose of the party and be careful not to turn it into an opportunity to show off yourself.

According to the third paragraph, it is good（）

点击查看答案&解析