The officials in the _______ at the London Heathrow Airport were very polite.A.Custom B.Customs C.custom D.customs为什么要选B
问题描述：
The officials in the _______ at the London Heathrow Airport were very polite.
A.Custom
B.Customs
C.custom
D.customs
为什么要选B
答
这句考察的是custom的复数的用法，customs不是习俗的复数，而是海关的意思，所以本句其实是说，伦敦Heathrow机场的海关工作人员都很有礼貌，所以选B
答
customs是海关的意思
答
customs,复数,是海关.custom,单数,是习俗.
Customs,大写,是特指某地的海关.这里指伦敦希思罗机场的海关.